verb tense in research paper

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Mastering the Use of Tenses in Your Research Paper 

Many students and early career researchers find themselves grappling with various aspects of academic writing. One critical aspect is ensuring correct grammar, most importantly the appropriate use of tenses in your research paper. In this article, we explain the basics of using tenses in scientific writing and list best practices for different sections of your academic manuscript. By understanding the role of tenses in your research paper and applying them accurately, you can enhance the clarity and credibility of our research work. 

Table of Contents

• Understanding the basics: Using tenses in research papers 
• The simple past tense: Literature review, methods 
• The past perfect tense: Methods, conclusion 
• The simple present tense: Introduction, results, tables and figures  
• The present perfect tense: Introduction, literature review 
• The future tense: Discussion, conclusions 
• How Paperpal can help you ensure correct usage of verb tenses in academic writing?  

Understanding the basics: Using tenses in research papers

Tenses in scientific writing serve as valuable tools to indicate the time frame in which certain actions or ideas take place. The simple past tense and simple present tense are the most used tenses in research papers. They are supplemented by the present perfect, past perfect, and occasionally the future tense. Consistency and precision are crucial in academic writing, so let’s into the basics of tenses in your research paper and discuss the recommended tenses for each section.

Fix language and grammar, including tense errors, in minutes with Paperpal. Try it for free!    

The simple past tense: Literature review, methods

Use this tense in your research paper when talking of or describing specific actions or events that occurred in the past; they should not be linked to the present in the same sentence. The simple past tense is used predominantly in the literature review to talk about existing research on the topic, for example, “Watson and Crick published their landmark paper on the structure of DNA in 1953.” It is also typically used in the methods section to describe the methods used in previous studies; what you did and how you did it. For example, “We selected five samples at random.” This tense in scientific writing can also be used to state facts that were once believed to be true but have since been invalidated, for example, “Bats were thought to be blind.”  

The past perfect tense: Methods, conclusion

Best used to describe two related events that occurred at different times in the past, this tense is typically used in the methods section, especially when describing earlier stages of the experimental procedure. For example, “By the time the temperature and humidity reached optimal levels, the plants had already begun to revive,” or “Respondents who had been grouped into different control groups were given a placebo instead of the new formulation.” Use the past perfect tense in your research paper to describe research or experiments that may have already been completed at the time of writing the manuscript and in the conclusion to summarize the research findings.  

The simple present tense: Introduction, results, tables and figures

A researcher or academic writer can use simple present tense in the introduction when stating the objectives of the study, to interpret the results, discuss the significance of the findings or to present conclusions. Use the simple present tense in your research papers when referring to results presented in tables and figures in your writing. For example, “Fig.3 shows that…”. The present tense an also be used to talk about the research paper as a whole, for example, “Section 4.1 discusses…”. 

This tense in scientific writing is also used to state what is generally true and what is unlikely to change. For example, “The Earth revolves around the sun” or “Human babies generally start speaking when they are 2 years old.” This tense works well in the results section , which indicates what one believes to be true and relevant to the present research. For example, “Robinson maintains that soaking seeds in strong acid helps in breaking seed dormancy.”  

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The present perfect tense: Introduction, literature review

The present perfect tense in scientific writing is used to talk about a past event that is linked to the present or to talk about trends or events that have occurred recently. One may need to use this tense in the introduction while providing a background to the study. For example, “The demand for more sophisticated 5G devices has increased significantly over the past few years.” Additionally, the present perfect tense is also used frequently in the literature review sections while referring to previous research that is fairly recent. For example, “Recent experiments on the samples collected have revealed high levels of saline.”  

The future tense: Discussion, conclusions  

Use the future tense in your research paper when describing events that are expected to occur in the future; this is not very common in academic writing. Typically, its use is limited to the discussion section toward the end, when one needs to make recommendations or indicate a future course of action based on the research results. It is usually recommended that parts of the conclusion section be written in the future tense. For example, “These research findings will open up new possibilities for the effective use of Epsom salt in agriculture.”  

Remember that the grammar and tense guidelines provided above are not hard and fast rules, which can make it more confusing, especially for those who do not have English as their first language. Ask peers to proofread your work carefully for incorrect or mixed tenses in a single sentence or paragraph or turn to trusted AI academic writing tools like Paperpal. 

How Paperpal can help you ensure correct usage of verb tenses in academic writing?   

Academic writing demands high-quality standards; it’s essential to adhere to grammar and style conventions. This ensures conformity with institutional and field-specific standards, and clarity in communicating what was studied, when it happened, and from which perspective the research is discussed. To determine the flow and coherency of your paper, using the right verb tenses is essential.  

Here’s how Paperpal, an AI academic writing assistant, can help you maintain consistency in verb tenses so that readers can easily follow the progress of your ideas and arguments: 

• Sign Up or Log In: Start by creating an account or logging into Paperpal . 
• Paste your content: Once logged in, paste your research paper’s content onto the writing document. 
• Get language and grammar suggestions: Click on the Edit icon on the right pane. Paperpal analyzes your text to identify errors, including verb form, tense usage, spellings, punctuations, word choice, and grammar. 
• Fix errors and review: You can accept the relevant suggestions, and reject the irrelevant ones, and correct all the errors in a go.  

Researchers need to familiarize themselves with the correct use of tenses in research papers, but with Paperpal, it gets easier. Paperpal is not just a grammar and language checker. It also provides rewriting, word reduction, and academic tone checks to align your writing with academic conventions. You can even build your writing skills and learn how to avoid such errors in the future with Paperpal’s detailed writing “tips” with simple explanations for editing suggestions.    

Understanding and implementing the appropriate use of tenses in different sections of your research paper is essential for effective communication of your ideas. By mastering the use of tenses in your research paper, you can ensure clarity, consistency, and accuracy and elevate the quality of your academic writing.  

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Effective Writing

To construct sentences that reflect your ideas, focus these sentences appropriately. Express one idea per sentence. Use your current topic — that is, what you are writing about — as the grammatical subject of your sentence (see Verbs: Choosing between active and passive voice ). When writing a complex sentence (a sentence that includes several clauses), place the main idea in the main clause rather than a subordinate clause. In particular, focus on the phenomenon at hand, not on the fact that you observed it.

Constructing your sentences logically is a good start, but it may not be enough. To ensure they are readable, make sure your sentences do not tax readers' short-term memory by obliging these readers to remember long pieces of text before knowing what to do with them. In other words, keep together what goes together. Then, work on conciseness: See whether you can replace long phrases with shorter ones or eliminate words without loss of clarity or accuracy.

The following screens cover the drafting process in more detail. Specifically, they discuss how to use verbs effectively and how to take care of your text's mechanics.

Shutterstock. Much of the strength of a clause comes from its verb. Therefore, to express your ideas accurately, choose an appropriate verb and use it well. In particular, use it in the right tense, choose carefully between active and passive voice, and avoid dangling verb forms.

Verbs are for describing actions, states, or occurrences. To give a clause its full strength and keep it short, do not bury the action, state, or occurrence in a noun (typically combined with a weak verb), as in "The catalyst produced a significant increase in conversion rate." Instead write, "The catalyst increased the conversion rate significantly." The examples below show how an action, state, or occurrence can be moved from a noun back to a verb.

Using the right tense

In your scientific paper, use verb tenses (past, present, and future) exactly as you would in ordinary writing. Use the past tense to report what happened in the past: what you did, what someone reported, what happened in an experiment, and so on. Use the present tense to express general truths, such as conclusions (drawn by you or by others) and atemporal facts (including information about what the paper does or covers). Reserve the future tense for perspectives: what you will do in the coming months or years. Typically, most of your sentences will be in the past tense, some will be in the present tense, and very few, if any, will be in the future tense.

Work done We collected blood samples from . . . Groves et al. determined the growth rate of . . . Consequently, astronomers decided to rename . . . Work reported Jankowsky reported a similar growth rate . . . In 2009, Chu published an alternative method to . . . Irarrázaval observed the opposite behavior in . . . Observations The mice in Group A developed , on average, twice as much . . . The number of defects increased sharply . . . The conversion rate was close to 95% . . .

Present tense

General truths Microbes in the human gut have a profound influence on . . . The Reynolds number provides a measure of . . . Smoking increases the risk of coronary heart disease . . . Atemporal facts This paper presents the results of . . . Section 3.1 explains the difference between . . . Behbood's 1969 paper provides a framework for . . .

Future tense

Perspectives In a follow-up experiment, we will study the role of . . . The influence of temperature will be the object of future research . . .

Note the difference in scope between a statement in the past tense and the same statement in the present tense: "The temperature increased linearly over time" refers to a specific experiment, whereas "The temperature increases linearly over time" generalizes the experimental observation, suggesting that the temperature always increases linearly over time in such circumstances.

In complex sentences, you may have to combine two different tenses — for example, "In 1905, Albert Einstein postulated that the speed of light is constant . . . . " In this sentence, postulated refers to something that happened in the past (in 1905) and is therefore in the past tense, whereas is expresses a general truth and is in the present tense.

Choosing between active and passive voice

In English, verbs can express an action in one of two voices. The active voice focuses on the agent: "John measured the temperature." (Here, the agent — John — is the grammatical subject of the sentence.) In contrast, the passive voice focuses on the object that is acted upon: "The temperature was measured by John." (Here, the temperature, not John, is the grammatical subject of the sentence.)

To choose between active and passive voice, consider above all what you are discussing (your topic) and place it in the subject position. For example, should you write "The preprocessor sorts the two arrays" or "The two arrays are sorted by the preprocessor"? If you are discussing the preprocessor, the first sentence is the better option. In contrast, if you are discussing the arrays, the second sentence is better. If you are unsure what you are discussing, consider the surrounding sentences: Are they about the preprocessor or the two arrays?

The desire to be objective in scientific writing has led to an overuse of the passive voice, often accompanied by the exclusion of agents: "The temperature was measured " (with the verb at the end of the sentence). Admittedly, the agent is often irrelevant: No matter who measured the temperature, we would expect its value to be the same. However, a systematic preference for the passive voice is by no means optimal, for at least two reasons.

For one, sentences written in the passive voice are often less interesting or more difficult to read than those written in the active voice. A verb in the active voice does not require a person as the agent; an inanimate object is often appropriate. For example, the rather uninteresting sentence "The temperature was measured . . . " may be replaced by the more interesting "The measured temperature of 253°C suggests a secondary reaction in . . . ." In the second sentence, the subject is still temperature (so the focus remains the same), but the verb suggests is in the active voice. Similarly, the hard-to-read sentence "In this section, a discussion of the influence of the recirculating-water temperature on the conversion rate of . . . is presented " (long subject, verb at the end) can be turned into "This section discusses the influence of . . . . " The subject is now section , which is what this sentence is really about, yet the focus on the discussion has been maintained through the active-voice verb discusses .

As a second argument against a systematic preference for the passive voice, readers sometimes need people to be mentioned. A sentence such as "The temperature is believed to be the cause for . . . " is ambiguous. Readers will want to know who believes this — the authors of the paper, or the scientific community as a whole? To clarify the sentence, use the active voice and set the appropriate people as the subject, in either the third or the first person, as in the examples below.

Biologists believe the temperature to be . . . Keustermans et al. (1997) believe the temperature to be . . . The authors believe the temperature to be . . . We believe the temperature to be . . .

Avoiding dangling verb forms

A verb form needs a subject, either expressed or implied. When the verb is in a non-finite form, such as an infinitive ( to do ) or a participle ( doing ), its subject is implied to be the subject of the clause, or sometimes the closest noun phrase. In such cases, construct your sentences carefully to avoid suggesting nonsense. Consider the following two examples.

To dissect its brain, the affected fly was mounted on a . . . After aging for 72 hours at 50°C, we observed a shift in . . .

Here, the first sentence implies that the affected fly dissected its own brain, and the second implies that the authors of the paper needed to age for 72 hours at 50°C in order to observe the shift. To restore the intended meaning while keeping the infinitive to dissect or the participle aging , change the subject of each sentence as appropriate:

To dissect its brain, we mounted the affected fly on a . . . After aging for 72 hours at 50°C, the samples exhibited a shift in . . .

Alternatively, you can change or remove the infinitive or participle to restore the intended meaning:

To have its brain dissected , the affected fly was mounted on a . . . After the samples aged for 72 hours at 50°C, we observed a shift in . . .

In communication, every detail counts. Although your focus should be on conveying your message through an appropriate structure at all levels, you should also save some time to attend to the more mechanical aspects of writing in English, such as using abbreviations, writing numbers, capitalizing words, using hyphens when needed, and punctuating your text correctly.

Using abbreviations

Beware of overusing abbreviations, especially acronyms — such as GNP for gold nanoparticles . Abbreviations help keep a text concise, but they can also render it cryptic. Many acronyms also have several possible extensions ( GNP also stands for gross national product ).

Write acronyms (and only acronyms) in all uppercase ( GNP , not gnp ).

Introduce acronyms systematically the first time they are used in a document. First write the full expression, then provide the acronym in parentheses. In the full expression, and unless the journal to which you submit your paper uses a different convention, capitalize the letters that form the acronym: "we prepared Gold NanoParticles (GNP) by . . . " These capitals help readers quickly recognize what the acronym designates.

• Do not use capitals in the full expression when you are not introducing an acronym: "we prepared gold nanoparticles by… "
• As a more general rule, use first what readers know or can understand best, then put in parentheses what may be new to them. If the acronym is better known than the full expression, as may be the case for techniques such as SEM or projects such as FALCON, consider placing the acronym first: "The FALCON (Fission-Activated Laser Concept) program at…"
• In the rare case that an acronym is commonly known, you might not need to introduce it. One example is DNA in the life sciences. When in doubt, however, introduce the acronym.

In papers, consider the abstract as a stand-alone document. Therefore, if you use an acronym in both the abstract and the corresponding full paper, introduce that acronym twice: the first time you use it in the abstract and the first time you use it in the full paper. However, if you find that you use an acronym only once or twice after introducing it in your abstract, the benefit of it is limited — consider avoiding the acronym and using the full expression each time (unless you think some readers know the acronym better than the full expression).

Writing numbers

In general, write single-digit numbers (zero to nine) in words, as in three hours , and multidigit numbers (10 and above) in numerals, as in 24 hours . This rule has many exceptions, but most of them are reasonably intuitive, as shown hereafter.

Use numerals for numbers from zero to nine

• when using them with abbreviated units ( 3 mV );
• in dates and times ( 3 October , 3 pm );
• to identify figures and other items ( Figure 3 );
• for consistency when these numbers are mixed with larger numbers ( series of 3, 7, and 24 experiments ).

Use words for numbers above 10 if these numbers come at the beginning of a sentence or heading ("Two thousand eight was a challenging year for . . . "). As an alternative, rephrase the sentence to avoid this issue altogether ("The year 2008 was challenging for . . . " ) .

Capitalizing words

Capitals are often overused. In English, use initial capitals

• at beginnings: the start of a sentence, of a heading, etc.;
• for proper nouns, including nouns describing groups (compare physics and the Physics Department );
• for items identified by their number (compare in the next figure and in Figure 2 ), unless the journal to which you submit your paper uses a different convention;
• for specific words: names of days ( Monday ) and months ( April ), adjectives of nationality ( Algerian ), etc.

In contrast, do not use initial capitals for common nouns: Resist the temptation to glorify a concept, technique, or compound with capitals. For example, write finite-element method (not Finite-Element Method ), mass spectrometry (not Mass Spectrometry ), carbon dioxide (not Carbon Dioxide ), and so on, unless you are introducing an acronym (see Mechanics: Using abbreviations ).

Using hyphens

Punctuating text.

Punctuation has many rules in English; here are three that are often a challenge for non-native speakers.

As a rule, insert a comma between the subject of the main clause and whatever comes in front of it, no matter how short, as in "Surprisingly, the temperature did not increase." This comma is not always required, but it often helps and never hurts the meaning of a sentence, so it is good practice.

In series of three or more items, separate items with commas ( red, white, and blue ; yesterday, today, or tomorrow ). Do not use a comma for a series of two items ( black and white ).

In displayed lists, use the same punctuation as you would in normal text (but consider dropping the and ).

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Verb Tenses in Academic Writing | Rules, Differences & Examples

Published on 20 October 2022 by Shane Bryson . Revised on 11 September 2023.

Tense communicates an event’s location in time. The different tenses are identified by their associated verb forms. There are three main verb tenses: past ,  present , and  future .

In English, each of these tenses can take four main aspects:  simple ,  perfect ,  continuous  (also known as  progressive ), and  perfect continuous . The perfect aspect is formed using the verb  to have , while the continuous aspect is formed using the verb  to be .

In academic writing , the most commonly used tenses are the  present simple , the  past simple , and the  present perfect .

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Table of contents

Tenses and their functions, when to use the present simple, when to use the past simple, when to use the present perfect, when to use other tenses.

The table below gives an overview of some of the basic functions of tenses and aspects. Tenses locate an event in time, while aspects communicate durations and relationships between events that happen at different times.

It can be difficult to pick the right verb tenses and use them consistently. If you struggle with verb tenses in your thesis or dissertation , you could consider using a thesis proofreading service .

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The present simple is the most commonly used tense in academic writing, so if in doubt, this should be your default choice of tense. There are two main situations where you always need to use the present tense.

Describing facts, generalisations, and explanations

Facts that are always true do not need to be located in a specific time, so they are stated in the present simple. You might state these types of facts when giving background information in your introduction .

• The Eiffel tower  is in Paris.
• Light  travels faster than sound.

Similarly, theories and generalisations based on facts are expressed in the present simple.

• Average income differs by race and gender.
• Older people express less concern about the environment than younger people.

Explanations of terms, theories, and ideas should also be written in the present simple.

• Photosynthesis  refers to  the process by which plants  convert sunlight into chemical energy.
• According to Piketty (2013), inequality grows over time in capitalist economies.

Describing the content of a text

Things that happen within the space of a text should be treated similarly to facts and generalisations.

This applies to fictional narratives in books, films, plays, etc. Use the present simple to describe the events or actions that are your main focus; other tenses can be used to mark different times within the text itself.

• In the first novel, Harry learns he is a wizard and travels  to Hogwarts for the first time, finally escaping the constraints of the family that raised him.

The events in the first part of the sentence are the writer’s main focus, so they are described in the present tense. The second part uses the past tense to add extra information about something that happened prior to those events within the book.

When discussing and analyzing nonfiction, similarly, use the present simple to describe what the author does within the pages of the text ( argues , explains , demonstrates , etc).

• In The History of Sexuality , Foucault asserts that sexual identity is a modern invention.
• Paglia (1993) critiques Foucault’s theory.

This rule also applies when you are describing what you do in your own text. When summarising the research in your abstract , describing your objectives, or giving an overview of the  dissertation structure in your introduction, the present simple is the best choice of tense.

• This research  aims to synthesise the two theories.
• Chapter 3 explains  the methodology and discusses ethical issues.
• The paper  concludes with recommendations for further research.

The past simple should be used to describe completed actions and events, including steps in the research process and historical background information.

Reporting research steps

Whether you are referring to your own research or someone else’s, use the past simple to report specific steps in the research process that have been completed.

• Olden (2017) recruited 17 participants for the study.
• We transcribed and coded the interviews before analyzing the results.

The past simple is also the most appropriate choice for reporting the results of your research.

• All of the focus group participants agreed  that the new version  was an improvement.
• We  found a positive correlation between the variables, but it  was not as strong as we  hypothesised .

Describing historical events

Background information about events that took place in the past should also be described in the past simple tense.

• James Joyce  pioneered the modernist use of stream of consciousness.
• Donald Trump’s election in 2016  contradicted the predictions of commentators.

The present perfect is used mainly to describe past research that took place over an unspecified time period. You can also use it to create a connection between the findings of past research and your own work.

Summarising previous work

When summarising a whole body of research or describing the history of an ongoing debate, use the present perfect.

• Many researchers  have investigated the effects of poverty on health.
• Studies  have shown a link between cancer and red meat consumption.
• Identity politics has been a topic of heated debate since the 1960s.
• The problem of free will  has vexed philosophers for centuries.

Similarly, when mentioning research that took place over an unspecified time period in the past (as opposed to a specific step or outcome of that research), use the present perfect instead of the past tense.

• Green et al.  have conducted extensive research on the ecological effects of wolf reintroduction.

Emphasising the present relevance of previous work

When describing the outcomes of past research with verbs like fi nd ,  discover or demonstrate , you can use either the past simple or the present perfect.

The present perfect is a good choice to emphasise the continuing relevance of a piece of research and its consequences for your own work. It implies that the current research will build on, follow from, or respond to what previous researchers have done.

• Smith (2015) has found that younger drivers are involved in more traffic accidents than older drivers, but more research is required to make effective policy recommendations.
• As Monbiot (2013)  has shown , ecological change is closely linked to social and political processes.

Note, however, that the facts and generalisations that emerge from past research are reported in the present simple.

While the above are the most commonly used tenses in academic writing, there are many cases where you’ll use other tenses to make distinctions between times.

Future simple

The future simple is used for making predictions or stating intentions. You can use it in a research proposal  to describe what you intend to do.

It is also sometimes used for making predictions and stating hypotheses . Take care, though, to avoid making statements about the future that imply a high level of certainty. It’s often a better choice to use other verbs like  expect ,  predict,  and  assume to make more cautious statements.

• There  will be a strong positive correlation.
• We  expect  to find a strong positive correlation.
• H1  predicts a strong positive correlation.

Similarly, when discussing the future implications of your research, rather than making statements with will,  try to use other verbs or modal verbs that imply possibility ( can ,  could ,  may ,  might ).

• These findings  will influence  future approaches to the topic.
• These findings  could influence future approaches to the topic.

Present, past, and future continuous

The continuous aspect is not commonly used in academic writing. It tends to convey an informal tone, and in most cases, the present simple or present perfect is a better choice.

• Some scholars are suggesting that mainstream economic paradigms are no longer adequate.
• Some scholars suggest   that mainstream economic paradigms are no longer adequate.
• Some scholars have suggested   that mainstream economic paradigms are no longer adequate.

However, in certain types of academic writing, such as literary and historical studies, the continuous aspect might be used in narrative descriptions or accounts of past events. It is often useful for positioning events in relation to one another.

• While Harry is traveling to Hogwarts for the first time, he meets many of the characters who will become central to the narrative.
• The country was still recovering from the recession when Donald Trump was elected.

Past perfect

Similarly, the past perfect is not commonly used, except in disciplines that require making fine distinctions between different points in the past or different points in a narrative’s plot.

Sources for this article

We strongly encourage students to use sources in their work. You can cite our article (APA Style) or take a deep dive into the articles below.

Bryson, S. (2023, September 11). Verb Tenses in Academic Writing | Rules, Differences & Examples. Scribbr. Retrieved 14 May 2024, from https://www.scribbr.co.uk/english-language/verb-tenses/

Aarts, B. (2011).  Oxford modern English grammar . Oxford University Press.

Butterfield, J. (Ed.). (2015).  Fowler’s dictionary of modern English usage  (4th ed.). Oxford University Press.

Garner, B. A. (2016).  Garner’s modern English usage (4th ed.). Oxford University Press.

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Shane Bryson

Shane finished his master's degree in English literature in 2013 and has been working as a writing tutor and editor since 2009. He began proofreading and editing essays with Scribbr in early summer, 2014.

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Verb Tenses

What this handout is about.

The present simple, past simple, and present perfect verb tenses account for approximately 80% of verb tense use in academic writing. This handout will help you understand how to use these three verb tenses in your own academic writing.

Click here for a color-coded illustration of changing verb tenses in academic writing.

Present simple tense

The present simple tense is used:

In your introduction, the present simple tense describes what we already know about the topic. In the conclusion, it says what we now know about the topic and what further research is still needed.

“The data suggest…” “The research shows…”

“The dinoflagellate’s TFVCs require an unidentified substance in fresh fish excreta” (Penrose and Katz, 330).

“There is evidence that…”

“So I’m walking through the park yesterday, and I hear all of this loud music and yelling. Turns out, there’s a free concert!” “Shakespeare captures human nature so accurately.”

Past simple tense

Past simple tense is used for two main functions in most academic fields.

“…customers obviously want to be treated at least as well on fishing vessels as they are by other recreation businesses. [General claim using simple present] De Young (1987) found the quality of service to be more important than catching fish in attracting repeat customers. [Specific claim from a previous study using simple past] (Marine Science)

We conducted a secondary data analysis… (Public Health) Descriptional statistical tests and t-student test were used for statistical analysis. (Medicine) The control group of students took the course previously… (Education)

Present perfect tense

The present perfect acts as a “bridge” tense by connecting some past event or state to the present moment. It implies that whatever is being referred to in the past is still true and relevant today.

“There have been several investigations into…” “Educators have always been interested in student learning.”

Some studies have shown that girls have significantly higher fears than boys after trauma (Pfefferbaum et al., 1999; Pine &; Cohen, 2002; Shaw, 2003). Other studies have found no gender differences (Rahav and Ronen, 1994). (Psychology)

Special notes

Can i change tenses.

Yes. English is a language that uses many verb tenses at the same time. The key is choosing the verb tense that is appropriate for what you’re trying to convey.

What’s the difference between present simple and past simple for reporting research results?

• Past simple limits your claims to the results of your own study. E.g., “Our study found that teenagers were moody.” (In this study, teenagers were moody.)
• Present simple elevates your claim to a generalization. E.g., “Our study found that teenagers are moody.” (Teenagers are always moody.)

Works consulted

We consulted these works while writing this handout. This is not a comprehensive list of resources on the handout’s topic, and we encourage you to do your own research to find additional publications. Please do not use this list as a model for the format of your own reference list, as it may not match the citation style you are using. For guidance on formatting citations, please see the UNC Libraries citation tutorial . We revise these tips periodically and welcome feedback.

Biber, Douglas. 1999. Longman Grammar of Spoken and Written English . New York: Longman.

Hawes, Thomas, and Sarah Thomas. 1997. “Tense Choices in Citations.” Research into the Teaching of English 31 (3): 393-414.

Hinkel, Eli. 2004. Teaching Academic ESL Writing: Practical Techniques in Vocabulary and Grammar . Mahwah, NJ: Lawrence Erlbaum Associates.

Penrose, Ann, and Steven Katz. 2004. Writing in the Sciences: Exploring the Conventions of Scientific Discourse , 2nd ed. New York: Longman.

Swales, John, and Christine B. Feak. 2004. Academic Writing for Graduate Students: Essential Tasks and Skills , 2nd ed. Ann Arbor: University of Michigan Press.

You may reproduce it for non-commercial use if you use the entire handout and attribute the source: The Writing Center, University of North Carolina at Chapel Hill

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How to Use Tenses within Scientific Writing

Written by: Chloe Collier

One’s tense will vary depending on what one is trying to convey within their paper or section of their paper. For example, the tense may change between the methods section and the discussion section.

Abstract --> Past tense

• The abstract is usually in the past tense due to it showing what has already been studied.

Example: “This study was conducted at the Iyarina Field School, and within the indigenous Waorani community within Yasuni National Park region.”

Introduction --> Present tense

• Example: “ Clidemia heterophylla and Piperaceae musteum are both plants with ant domata, meaning that there is an ant mutualism which protects them from a higher level of herbivory.”

Methods --> Past tense

• In the methods section one would use past tense due to what they have done was in the past.
• It has been debated whether one should use active or passive voice. The scientific journal Nature states that one should use active voice as to convey the concepts more directly.
• Example: “In the geographic areas selected for the study, ten random focal plants were selected as points for the study.”

Results --> Past tense

• Example: “We observed that there was no significant statistical difference in herbivory on Piperaceae between the two locations, Yasuni National Park, Ecuador (01° 10’ 11, 13”S and 77° 10’ 01. 47 NW) and Iyarina Field School, Ecuador (01° 02’ 35.2” S and 77° 43’ 02. 45” W), with the one exception being that there was found to be a statistical significance in the number count within a one-meter radius of Piperaceae musteum (Piperaceae).”

Discussion --> Present tense and past tense

• Example: “Symbiotic ant mutualistic relationships within species will defend their host plant since the plant provides them with food. In the case of Melastomataceae, they have swellings at the base of their petioles that house the ants and aid to protect them from herbivores.”
• One would use past tense to summarize one’s results
• Example: “In the future to further this experiment, we would expand this project and expand our sample size in order to have a more solid base for our findings.”

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Verb Tenses to Use in a Research Paper

Why Using the Correct Verb Tense is Important

When writing an academic paper, writers should follow the accepted grammar and style conventions: not only to abide by the institutional and domain standards, but to communicate clearly to readers what was studied, when it took place, and from what perspective you are discussing your research (and that of others) in your paper. One crucial writing element that you must consider when composing your paper is  verb tense . Which tense you use will determine the flow and coherency of your paper.

You might have found yourself thinking along these lines: “Everything in this study has already been completed, so shouldn’t I simply write everything in the simple past tense?”

The answer is no–at least not in a strict sense. The verb tense you use for a given sentence or phrase depends on your position as the author to the material you are discussing. As the author, you look at each element mentioned in your text from a distance in terms of your role: as a participant, critic, or messenger, among others. You must also take into account the chronological reasons for choosing between present and past tenses in a given instance.

Knowing which tense to use requires both knowledge of the exact guidelines set out for you in whichever formatting style you are following ( APA , AMA , etc.), as well as some discretion and savvy in choosing the tense that makes the most sense for a given statement in the paper.

While new authors should certainly familiarize themselves with the specific guidelines of the formatting style they are applying, this article will focus on the  most common rules of verb tense applied to research papers in journals and at academic institutions, reflecting basic verb usage rules in academic English and encompassing  all  formatting styles.

Bear in mind that these grammar and verb-tense issues will largely be corrected by any competent proofreading service or research paper editing service , and thus professional revision of all academic documents is recommended before submission to journals or conferences.

Rules for Present, Past, and Perfect Tense Verbs

First, there are three basic verb tenses used in research papers:  present  (simple present),  simple   past , and  present perfect . We will talk about how research paper sections determine verb tense in a minute, but first, let’s review when each tense should be used in general throughout the paper.

PRESENT TENSE VERBS

The present tense is used to talk about general facts, discuss current meanings and implications, and suggest future applications .

General facts are constant and do not change throughout time (the ultimate evolution of scientific progress notwithstanding). Always use the present when discussing general scientific facts.

Example: “Insulin and glucagon regulates blood glucose levels.” 

Implications are closely related to general facts and thus the same rule is applied.

Example: “An elevated glucose level indicates a lack of glucagon hormones in the pancreas.”

Further research is called for or stressed as important through a phrase in the present tense.

Example: “Further studies about glucagon receptors are needed.”

SIMPLE PAST TENSE VERBS

The simple past is generally used to discuss events that have been c ompleted in the past at some distinct time and/or place . It is most often applied to discrete events such as studies, experiments, or observed phenomena.

Example: “Scientists in Wales discovered a new enzyme in the liver.” Example: “Protocol X was used to analyze the data.”

PRESENT PERFECT TENSE VERBS

The present perfect tense (or simply “perfect tense”) is used in research papers to refer to  events or actions that have taken place at some unidentified time in the past or have started but are still ongoing or only recently completed . It often establishes a general background in the Introduction section , adding a backdrop on which you can explain the motivations for and purpose of your study.

Note that it is the least frequently used tense in most research papers and should not be over-employed–focus more on detailed actions by using the simple past.

Example:  “Many studies have focused on glucagon as an important regulating hormone.” Example:  “Until recently, researchers have analyzed this kind of data using Chi-Square Statistics.” Example:  “Efforts have been made to understand more about this process.”  (passive)

Appropriate Verb Tenses by Research Paper Section

It bears repeating that the “best” tense to use is the one that is recommended (or demanded) by whichever formatting manual you are using. However, there is a high degree of continuity between the common styles, and the following rules for usage in each section will likely apply to your research paper no matter where it will be published.

Abstract verb tenses

In general, use the simple past for the abstract of your manuscript; for a concise introductory sentence, use the present perfect. To establish a need for your study—–for instance, by explaining the current circumstances of the world or the specific area in which you are working—–you can also use the present tense.

Example of introductory sentence (present perfect): “Recent studies of glucagon and insulin production have led to breakthroughs in medicine.” Example of establishing background/circumstances/purpose (present): “Diabetes  accounts for a higher number of deaths in the US than previously calculated.”

For general statements and facts, the paper itself, or analysis of findings, use the present tense.

Example of a statement of fact: “In the US, diabetes is the most common endocrine disease.”

If you are stating a fact or finding from an earlier specified time or place, use the simple past:

Example: “In 2016, diabetes was the most common endocrine disease.” Have a look at our more in-depth instruction to writing an abstract for a research paper or at these do’s and don’ts of abstract writing if you need additional input.

Introduction section verb tenses

Use a mixture of present and past tense in the introduction section .

The present tense is applied when discussing something that is always true; the simple past tense is used for earlier research efforts, either your own or those reported by another group.

Example of earlier research efforts (simple past): “This same research team discovered a similar enzyme in their 2012 study.”

If the time or location of the demonstration is unknown or not important, use the present perfect.

Example: “Prior research has indicated a correlation between X and Y.”

For the concluding statements of your introduction, use the simple past or present perfect.

Example of concluding statement (simple past): “The CalTech glucagon studies were inconclusive.” Example of concluding statement (present perfect): “Prior research in this area has been inconclusive.”

Use the past perfect when you talk about something that happened or was found to be the case in the past, but which has since been revised. Example of revised information (past perfect): “The Dublonsky study had determined that X was Y, but a 2012 study found this to be incorrect.”

Literature review verb tenses

Knowing which tenses to use for a literature review (either as part of a research paper or as a stand-alone article) can be a bit tricky, as your usage depends both on which style manual you are using (APA, AMA, MLA , or others) and on how you are discussing the literature.

The simple past is usually applied when using the researcher’s name as the subject of the sentence and discussing the methods or results of that study itself

Example of describing researcher’s actions: “Pearson (1997) discovered a new enzyme using similar methods.”

Other verbs commonly found in this usage context: investigated, compared, studied, analyzed, investigated, found, confirmed, performed, etc.

When giving your opinion on another researcher’s work or bringing up the results, discussion, and conclusions they make in their work, use the present tense.

Example of discussing another’s work: “Ryuku (2005) concludes that there are no additional enzymes present in the liver, a finding this current study directly refutes.” Other verbs commonly found in this usage context: stresses, advocates, remarks, argues, claims, posits. etc.

Methods section verb tenses

The Methods section fairly clearly delineates between sections written in past and those written in present tense.

Use the simple past tense to talk about what you did. (Note that you will generally find the passive voice used when describing the actions of the researchers. This puts more focus on the actions being completed and less on the agents completing the action. Passive voice has become the general standard for research papers in recent decades, but it is okay to mix passive and active voice in order to make your paper clearer and more readable.)

Example of methods of study: “A glucose molecule was added to the mixture to see how the peptide would respond.” Example of methods of analysis: “The results were analyzed using Bayesian inference.”

Use the present tense to refer to or explain diagrams, figures, tables, and charts.

Example: “Table 5 shows the results of this first isolated test.” Example: “The results of this first isolated test are displayed in Table 5.”

Results section verb tenses

The verb tense rules for the Results section are quite similar to those applied to the Methods section.

Use the past tense to discuss actual results.

Example: “The addition of 0.02 μg of glycogen activated receptor cells.” Example: “Receptor cells were activated by the addition of 0.02 μg of glycogen.”

Use the simple present tense to explain diagrams/figures/tables. Again, sentences may use both the active and passive voice.

Discussion section verb tenses

The Discussion section consists of an analysis of the findings and a kind of translation of the meanings and implications of these findings.

Use the simple past to summarize your own findings.

Example of summarizing own findings: “The experiment yielded a number of results associated with the processing of glucose.”

Use the present tense to interpret and discuss the significance of your findings.

Example: “[This study confirms that] synthetic glucagon is two-thirds as effective at decreasing fatty acid synthesis.”

Conclusions and further work

The conclusion and call for further work to be done are either provided in the last sentence or two of your paper or in a separate (but short) section at the end of the main text (check the target journal’s author instructions to be sure you follow the journal style) and summarize or emphasize the new insights your work offers.

Use the present perfect tense to clarify that your statements still hold true at the time of reading.

Example: “Results from this study have led to a deeper understanding about how different peptides interact in this enzyme.”

Use the present tense to apply findings, state implications, and suggest further research.

Example of wider implications: “This study confirms that endogenous glucagon is even more essential in metabolism than previously thought.”

When discussing further research that is either needed or intended to be carried out, the future or present tense (or subjunctive mood) can also be used, in addition to the present tense passive voice.

Example of call for future research: “Further clinical studies are needed/will be needed/must be carried out/should be carried out to isolate the cause of this reaction.”

Follow these general rules about tenses and your paper will be clearer, more chronologically correct, and generally easier to read—meaning the important implications of your study will be more easily understood. You can always go back and edit verb tenses—the more you practice, and the more papers you read, the easier it will be to identify which tense should be used for which kind of information.

Verb tenses in scientific writing: Which tense should you use?

If you’re fluent in English, using tenses in scientific writing should come naturally to you. You shouldn’t need to flip through a grammar book, ask a freelance editor, or search online for “methods tense” or “literature review tense”.

But verb tenses may start to haunt you if you’re writing an article for a top peer-reviewed journal and you know you have to get every detail right. For example, you may wonder, What tense should be used in methodology sections? Should the introduction or literature review be written in the present tense or past tense?

In this post I’m going to answer these and other questions on verb tenses in scientific writing to make it easier for you to understand which tenses to use in a research paper.

Past or present tense in a cademic writing? It depends.

There’s  no consensus on how authors should be using verb tenses in scientific writing. Here is a summary of the main recommendations of academic writing experts on tenses in scientific writing.

Literature review verb tense

For the literature review, most academic editors recommend using the past simple or present perfect when talking about past research.

Use the past simple to discuss what was done in the past (the authors collected, investigated, analyzed, etc.).

Use present perfect to talk about findings from previous studies that are still valid today (the author has shown, has demonstrated, etc.).

If you don’t want to use the past simple or present perfect tense in literature review sections, your other option is the present simple tense. This is the so-called literary present.

Writing the literature review in the present simple tense helps simulate an ongoing academic conversation , to which you’re contributing (“Author et al. (2021) find…, discuss…, examine… imply…”).

In summary, what tense should the introduction be written in?

• Past simple or present perfect tense for past research
• Present simple for general truths or for the entire literature review section

Verb tenses in the methodology and results sections

For the methodology, almost all academic writing resources agree that the past simple tense is the logical choice. You are discussing what you did (collected data, analyzed them, and derived your results)—and all of that happened in the past.

However, you may also need to use the present simple tense to refer to figures and tables.

In summary, what tense should methods be written in?

For the methodology section, use these tenses:

• the past simple tense to explain your methods
• the present simple tense to refer to figures or tables

What tense should a discussion be written in?

Tenses for the discussion are similar to those for the introduction:

• past simple or present perfect tense when referring to what you did (past research)
• present simple for general truths or for interpretations of your data

Verb tenses in the conclusion section

For the conclusion, you may need to use several tenses. Again, when referring to general truths or implications of your results, use the present simple. When referring to what you did, use the past simple or present perfect tense.

Use the simple past when discussing the research you completed and is no longer continuing. Use the present perfect when discussing an action that started in the past and is still happening now, or an action that happens regularly.

So, for the conclusion, use these tenses:

• present simple for things that are true at the time of writing, the conclusions of your study, and its implications
• past simple or present perfect tense for past work

Knowing how to use verb tenses in scientific writing is better than imitating other authors

In scientific writing, using verb tenses inconsistently or unnecessarily shifting tenses means sloppy writing. A poorly written manuscript submitted to a peer-reviewed journal will come back with a long list of revisions—if it’s accepted for publication. Hiring a freelance editor for research papers can help you polish your writing style and improve the likelihood that your manuscript will be accepted the second time.

If you don’t want to hire a freelance editor, you may need to edit your own research paper . Mastering verb tenses in scientific writing will help you make the right choice for each section of your paper.

Try to resist the temptation to imitate others’ writing style. It’s common for new authors to learn academic writing the same way they learned to speak: by imitation. They peruse some articles published in their target journal to see what verb tenses other authors used and then make the same choices.

However, this is not such a great idea, because not all published articles are examples of good writing. You risk imitating an author that didn’t pay much attention to verb tenses in scientific writing, or whose work was edited by someone with little experience.

How to choose the right verb tenses for a research paper

If emulating others’ writing style comes with the risk of picking up bad habits, how do you choose the right verb tense to use in a scholarly paper?

Unfortunately, style guides, academic writing books, and academic editors give conflicting advice. A solution to this problem is to follow the recommendations of your university’s writing center if you’re writing a PhD thesis or dissertation. If, however, you’re writing a research paper for a journal, follow its guidelines.

Some publishers may let you choose any style guide as long as you’re consistent. In that case, go with the style popular in your academic field (for example, APA Style in social sciences).

Example: Verb tenses in APA Style

If you need to follow the APA Style, it has precise instructions on using verb tenses in research papers:

• Introduction and literature review: To talk about previous studies, use the past simple or present perfect; for findings that continue to be true, use the present simple.
• Methodology and results: To talk about your methods or results, use the past simple or present perfect.
• Conclusions: Write the conclusions of your research and implications of your findings in the present simple.

Here are some examples to help you understand how to use verb tenses in APA:

• Past simple tense to discuss past work:

Author A (2017) showed that varied populations display similar patterns, but Author B demonstrated that patterns vary wildly

• Present perfect to discuss findings from previous studies that are still valid today:

Other researchers have described similar processes in other environments

• Present simple to express general truths, facts, or ideas accepted today:

Most researchers agree that our species appeared in Africa

• Present perfect or past simple tense to describe your methods and results:

We have observed no variation in the economic growth rate, but found it depends on several factors

• Present simple tense to describe the conclusions and implications of your study:

Our results indicate a strong correlation between A and B, but we need further research in this area

Use the right tenses in scientific writing for clarity

The goal of using the right verb tenses in scientific writing is clarity. So, whether you follow your instincts, your advisor’s suggestions, an editor’s recommendations, or a style guide, aim at clarity and logic. A well-written manuscript will have a better chance of being accepted for publication. Also, it won’t require several rounds of revision to improve its language, meaning you save time and can focus on your science.

Do you need to hire a freelance editor for a research paper? Send me a message at [email protected].

Related posts:

• Write your research paper outline
• Should I edit my own research paper?
• Academic editing tips I wish I knew as a research scientist

Last revised on 23 June 2022

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Grammar: Verb Tenses

Most common verb tenses in academic writing.

According to corpus research, in academic writing, the three tenses used the most often are the simple present , the simple past , and the present perfect (Biber et al., 1999; Caplan, 2012). The next most common tense for capstone writers is the future ; the doctoral study/dissertation proposal at Walden is written in this tense for a study that will be conducted in the future.

Biber, D., Johansson, S., Leech, G., Conrad, S., & Finegan, E. (1999). Longman grammar of written and spoken English . Pearson. https://doi.org/10.1162/089120101300346831

Caplan, N. A. (2012). Grammar choices for graduate and professional writers . University of Michigan Press.

Simple present: Use the simple present to describe a general truth or a habitual action. This tense indicates that the statement is generally true in the past, present, and future.

• Example: The hospital admits patients whether or not they have proof of insurance.

Simple past : Use the simple past tense to describe a completed action that took place at a specific point in the past (e.g., last year, 1 hour ago, last Sunday). In the example below, the specific point of time in the past is 1998.

• Example: Zimbardo (1998) researched many aspects of social psychology.

Present perfect: Use the present perfect to indicate an action that occurred at a nonspecific time in the past. This action has relevance in the present. The present perfect is also sometimes used to introduce background information in a paragraph. After the first sentence, the tense shifts to the simple past.

• Example: Numerous researchers have used this method.
• Example: Many researchers have studied how small business owners can be successful beyond the initial few years in business. They found common themes among the small business owners.

Future: Use the future to describe an action that will take place at a particular point in the future (at Walden, this is used especially when writing a proposal for a doctoral capstone study).

• Example: I will conduct semistructured interviews.

Keep in mind that verb tenses should be adjusted after the proposal after the research has been completed. See this blog post about Revising the Proposal for the Final Capstone Document for more information.

APA Style Guidelines on Verb Tense

APA calls for consistency and accuracy in verb tense usage (see APA 7, Section 4.12 and Table 4.1). In other words, avoid unnecessary shifts in verb tense within a paragraph or in adjacent paragraphs to help ensure smooth expression.

• Use the past tense (e.g., researchers presented ) or the present perfect (e.g., researchers have presented ) for the literature review and the description of the procedure if discussing past events.
• Use the past tense to describe the results (e.g., test scores improved significantly).
• Use the present tense to discuss implications of the results and present conclusions (e.g., the results of the study show …).

When explaining what an author or researcher wrote or did, use the past tense.

• Patterson (2012) presented, found, stated, discovered…

However, there can be a shift to the present tense if the research findings still hold true:

• King (2010) found  that revising a document three times improves the final grade.
• Smith (2016) discovered that the treatment is effective.

Verb Tense Guidelines When Referring to the Document Itself

To preview what is coming in the document or to explain what is happening at that moment in the document, use the present or future tense:

• In this study, I will describe …
• In this study, I describe …
• In the next chapter, I will discuss …
• In the next chapter, I discuss …

To refer back to information already covered, such as summaries of discussions that have already taken place or conclusions to chapters/sections, use the past tense:

• Chapter 1 contained my original discussion of the research questions.
• In summary, in this section, I presented information on…

Simple Past Versus the Present Perfect

Rules for the use of the present perfect differ slightly in British and American English. Researchers have also found that among American English writers, sometimes individual preferences dictate whether the simple past or the present perfect is used. In other words, one American English writer may choose the simple past in a place where another American English writer may choose the present perfect.

Keep in mind, however, that the simple past is used for a completed action.  It often is used with signal words or phrases such as "yesterday," "last week," "1 year ago," or "in 2015" to indicate the specific time in the past when the action took place.

• I went to China in 2010 .
• He completed the employee performance reviews last month .

The present perfect focuses more on an action that occurred without focusing on the specific time it happened. Note that the specific time is not given, just that the action has occurred.

• I have travelled to China.

The present perfect focuses more on the result of the action.

• He has completed the employee performance reviews.

The present perfect is often used with signal words such as "since," "already," "just," "until now," "(not) yet," "so far," "ever," "lately," or "recently."

• I have already travelled to China.
• He has recently completed the employee performance reviews.
• Researchers have used this method since it was developed.

Summary of English Verb Tenses

The 12 main tenses:

• Simple present : She writes every day.
• Present progressive: She is writing right now.
• Simple past : She wrote last night.
• Past progressive: She was writing when he called.
• Simple future : She will write tomorrow.
• Future progressive: She will be writing when you arrive.
• Present perfect : She has written Chapter 1.
• Present perfect progressive: She has been writing for 2 hours.
• Past perfect: She had written Chapter 3 before she started Chapter 4.
• Past perfect progressive: She had been writing for 2 hours before her friends arrived.
• Future perfect: She will have written Chapter 4 before she writes Chapter 5.
• Future perfect progressive: She will have been writing for 2 hours by the time her friends come over.

Conditionals:

Zero conditional (general truths/general habits).

• Example: If I have time, I write every day.

First conditional (possible or likely things in the future).

• Example: If I have time, I will write every day.

Second conditional (impossible things in the present/unlikely in the future).

• Example : If I had time, I would write every day.

Third conditional (things that did not happen in the past and their imaginary results)

• Example : If I had had time, I would have written every day.

Subjunctive : This form is sometimes used in that -clauses that are the object of certain verbs or follow certain adjectives. The form of the subjective is the simple form of the verb. It is the same for all persons and number.

• Example : I recommend that he study every day.
• Example: It is important that everyone set a writing schedule.

Verbs Video Playlist

Note that these videos were created while APA 6 was the style guide edition in use. There may be some examples of writing that have not been updated to APA 7 guidelines.

• Grammar for Academic Writers: Common Verb Tenses in Academic Writing (video transcript)
• Grammar for Academic Writers: Verb Tense Consistency (video transcript)
• Grammar for Academic Writers: Advanced Subject–Verb Agreement (video transcript)
• Mastering the Mechanics: Helping Verbs (video transcript)
• Mastering the Mechanics: Past Tense (video transcript)
• Mastering the Mechanics: Present Tense (video transcript)
• Mastering the Mechanics: Future Tense (video transcript)

Related Resources

Knowledge Check: Verb Tenses

Didn't find what you need? Email us at [email protected] .

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Present and Past Tenses Used in Research Papers

• First Online: 30 June 2022

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Below are some guidelines on the use of the three most common tenses in research papers: present simple , present perfect , past simple . These guidelines are NOT grammatical rules. The guidelines can be broken. They vary depending on the author, the discipline, and the journal.

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Wallwork, A. (2022). Present and Past Tenses Used in Research Papers. In: Essential English Grammar and Communication Strategies. English for Academic Research. Springer, Cham. https://doi.org/10.1007/978-3-030-95612-7_11

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Working Paper 24-04: Measuring Price Effects from Disasters Using Public Data: A Case Study of Hurricane Ian

​Justin C. Contat, William M. Doerner, Robert N. Renner, and Malcolm J. Rogers

​​Ab​stract:

Natural disasters can disrupt housing markets, causing destruction to communities and distress to economic activity. To estimate the effects of disasters on home prices, publicly-available data on property damages are often used to classify “treated” properties. However, by design these data lack precise geospatial information, leading to measurement error in the treatment variable as aggregate measures must be used. We leverage leading difference-in-differences and synthetic control methodologies across various treatments and levels of geography to measure price effects with such data following Hurricane Ian’s unexpected landfall in southwest Florida during September 2022, coinciding with the state’s initial recovery from the COVID-19 pandemic. Empirical results suggest positive, time-varying price effects, though we place caveats on these results as there may be many mechanisms underway; our results should be interpreted as descriptive correlations and not causal effects for various reasons. Our main contribution is methodological, highlighting the importance of robustness checks, functional form, statistical techniques, and testing across different samples. Additionally, quicker access to high quality public data could enhance quantitatively-informed conversations on natural disaster effects.​

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Computer Science > Computation and Language

Title: qserve: w4a8kv4 quantization and system co-design for efficient llm serving.

Abstract: Quantization can accelerate large language model (LLM) inference. Going beyond INT8 quantization, the research community is actively exploring even lower precision, such as INT4. Nonetheless, state-of-the-art INT4 quantization techniques only accelerate low-batch, edge LLM inference, failing to deliver performance gains in large-batch, cloud-based LLM serving. We uncover a critical issue: existing INT4 quantization methods suffer from significant runtime overhead (20-90%) when dequantizing either weights or partial sums on GPUs. To address this challenge, we introduce QoQ, a W4A8KV4 quantization algorithm with 4-bit weight, 8-bit activation, and 4-bit KV cache. QoQ stands for quattuor-octo-quattuor, which represents 4-8-4 in Latin. QoQ is implemented by the QServe inference library that achieves measured speedup. The key insight driving QServe is that the efficiency of LLM serving on GPUs is critically influenced by operations on low-throughput CUDA cores. Building upon this insight, in QoQ algorithm, we introduce progressive quantization that can allow low dequantization overhead in W4A8 GEMM. Additionally, we develop SmoothAttention to effectively mitigate the accuracy degradation incurred by 4-bit KV quantization. In the QServe system, we perform compute-aware weight reordering and take advantage of register-level parallelism to reduce dequantization latency. We also make fused attention memory-bound, harnessing the performance gain brought by KV4 quantization. As a result, QServe improves the maximum achievable serving throughput of Llama-3-8B by 1.2x on A100, 1.4x on L40S; and Qwen1.5-72B by 2.4x on A100, 3.5x on L40S, compared to TensorRT-LLM. Remarkably, QServe on L40S GPU can achieve even higher throughput than TensorRT-LLM on A100. Thus, QServe effectively reduces the dollar cost of LLM serving by 3x. Code is available at this https URL .

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Demand-side and Supply-side Constraints in the Market for Financial Advice

In this review, we argue that access to financial advice and the quality of this advice is shaped by a broad array of demand-side and supply-side constraints. While the literature has predominantly focused on conflicts of interest between advisors and clients, we highlight that the transaction costs of providing advice, mistaken beliefs on the demand side or supply side, and other factors can have equally detrimental effects on the quality and access to advice. Moreover, these factors affect how researchers should assess the impact of financial advice across heterogeneous groups of households. While households with low levels of financial literacy are more likely to benefit from advice—potentially including conflicted advice—they are also the least likely to detect misconduct, and perhaps the least likely to understand the value of paying for advice. Regulators should consider not only how regulation changes the quality of advice, but also the fraction of households who are able to receive it and how different groups would have invested without any advice. Financial innovation has the potential to provide customized advice at low cost, but also to embed conflicts of interest in algorithms that are opaque to households and regulators.

Jonathan Reuter is affiliated with Boston College and NBER. Antoinette Schoar is affiliated with MIT Sloan, ideas42 and NBER. The authors thank Roman Inderst (editor) for helpful comments and Xin Xiong for helpful research assistance. Neither author has any funding or material and relevant financial relationships to disclose. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research.

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New research aims to gauge brain power of the T. rex

In December 2022, Vanderbilt University neuroscientist Suzana Herculano-Houzel published a paper that caused an uproar in the dinosaur world.

After analyzing previous research on fossilized dinosaur brain cavities and the neuron counts of birds and other related living animals, Herculano-Houzel extrapolated that the fearsome Tyrannosaurus rex may have had more than 3 billion neurons — more than a baboon.

As a result, she argued, the predators could have been smart enough to make and use tools and to form social cultures akin to those seen in present-day primates.

The original “Jurassic Park” film spooked audiences by imagining velociraptors smart enough to open doors. Herculano-Houzel’s paper described T. rex as essentially wily enough to sharpen their own shivs. The bold claims made headlines, and almost immediately attracted scrutiny and skepticism from paleontologists.

In a paper published Monday in “The Anatomical Record,” an international team of paleontologists, neuroscientists and behavioral scientists argue that Herculano-Houzel’s assumptions about brain cavity size and corresponding neuron counts were off-base.

True T. rex intelligence, the scientists say, was probably much closer to that of modern-day crocodiles than primates — a perfectly respectable amount of smarts for a therapod to have.

“What needs to be emphasized is that reptiles are certainly not as dim-witted as is commonly believed,” said Kai Caspar, a biologist at Heinrich Heine University Düsseldorf and co-author of the paper. “So whereas there is no reason to assume that T. rex had primate-like habits, it was certainly a behaviorally sophisticated animal.”

Brain tissue doesn’t fossilize, and so researchers examine the shape and size of the brain cavity in fossilized dinosaur skulls to deduce what their brains may have been like.

In their analysis, the authors took issue with Herculano-Houzel’s assumption that dinosaur brains filled their skull cavities in a proportion similar to bird brains. Herculano-Houzel’s analysis posited that T. rex brains occupied most of their brain cavity, analogous to that of the modern-day ostrich.

But dinosaur brain cases more closely resemble those of modern-day reptiles like crocodiles, Caspar said. For animals like crocodiles, brain matter occupies only 30% to 50% of the brain cavity. Though brain size isn’t a perfect predictor of neuron numbers, a much smaller organ would have far fewer than the 3 billion neurons Herculano-Houzel projected.

“T. rex does come out as the biggest-brained big dinosaur we studied, and the biggest one not closely related to modern birds, but we couldn’t find the 2 to 3 billion neurons she found, even under our most generous estimates,” said co-author Thomas R. Holtz, Jr., a vertebrate paleontologist at University of Maryland, College Park.

What’s more, the research team argued, neuron counts aren’t an ideal indicator of an animal’s intelligence.

Giraffes have roughly the same number of neurons that crows and baboons have, Holtz pointed out, but they don’t use tools or display complex social behavior in the way those species do.

“Obviously in broad strokes you need more neurons to create more thoughts and memories and to solve problems,” Holtz said, but the sheer number of neurons an animal has can’t tell us how the animal will use them.

“Neuronal counts really are comparable to the storage capacity and active memory on your laptop, but cognition and behavior is more like the operating system,” he said. “Not all animal brains are running the same software.”

Based on CT scan reconstructions, the T. rex brain was probably “ a long tube that has very little in terms of the cortical expansion that you see in a primate or a modern bird,” said paleontologist Luis Chiappe, director of the Dinosaur Institute at the Natural History Museum of Los Angeles County.

“The argument that a T. Rex would have been as intelligent as a primate — no. That makes no sense to me,” said Chiappe, who was not involved in the study.

Like many paleontologists, Chiappe and his colleagues at the Dinosaur Institute were skeptical of Herculano-Houzel’s original conclusions. The new paper is more consistent with previous understandings of dinosaur anatomy and intelligence, he said.

“I am delighted to see that my simple study using solid data published by paleontologists opened the way for new studies,” Herculano-Houzel said in an email. “Readers should analyze the evidence and draw their own conclusions. That’s what science is about!”

When thinking about the inner life of T. rex, the most important takeaway is that reptilian intelligence is in fact more sophisticated than our species often assumes, scientists said.

“These animals engage in play, are capable of being trained, and even show excitement when they see their owners,” Holtz said. “What we found doesn’t mean that T. rex was a mindless automaton; but neither was it going to organize a Triceratops rodeo or pass down stories of the duckbill that was THAT BIG but got away.”

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