The word data can be singular or plural in modern English, depending on whether the writer treats it as a mass of information or as multiple observations. Use data are in formal scientific writing when individual results are emphasized; use data is when data means an integrated information set, especially in technology and business. Consistency and audience matter more than Latin etymology alone.
Key Facts
Data is historically the plural of the Latin noun datum.
Data is is standard in much contemporary technical, business, and general English.
Data are remains common and often preferred in scientific, statistical, and academic prose.
Use a datum, a data point, or a piece of data for one item.
Use much data when treating data as a mass and many data points when counting observations.
Datums is normally correct only for geodetic or surveying reference systems.
Is Data Singular or Plural in English?
Data has two established grammatical patterns in English. As a plural count noun, data takes plural verbs: “The data are incomplete.” As a singular mass noun, data takes singular verbs: “The data is stored on a secure server.” Both patterns are widely used, but formal scientific communities tend to retain the plural pattern more often.
The difference is semantic, not merely grammatical. A researcher discussing separate measurements may view data as a set of observations, while a database administrator may view data as one stored information resource. English already permits this type of shift with words such as paper, glass, and experience, whose grammatical behavior changes with meaning.
Latin history explains why some editors prefer data are, but historical origin does not automatically control present-day English. The Oxford English Dictionary records both plural and mass-noun uses, and major editorial communities continue to make different choices.
The Shortest Reliable Rule
Choose the verb that matches the meaning and audience:
- The data are consistent across all 12 experiments.
The sentence emphasizes separate experimental results. - The data is encrypted at rest.
The sentence treats data as a stored technical resource. - The data show a statistically significant difference.
The observations produce a result. - The data shows a clear pattern.
The information set presents one pattern.
For a document read by several audiences, follow the publication’s style sheet. If no house rule exists, singular data is usually the least conspicuous choice in general and technology writing, while plural data remains the safest choice in formal research reporting.
What Is the Difference Between Plural Data and Mass-Noun Data?
Plural data refers to individual facts, measurements, or observations, while mass-noun data refers to information considered as an undivided resource. Plural data pairs with are, were, and have; mass-noun data pairs with is, was, and has.
| Meaning of data | Typical verb | Natural modifier | Example |
|---|---|---|---|
| Separate observations | are | many | Many data are missing |
| Research results | were | few | Few data were available |
| Stored information | is | much | Too much data is retained |
| Digital resource | has | little | Little data has been deleted |
| Individual values | show | several | The data show four effects |
| Unified reporting set | shows | enough | The data shows one trend |
The mass-noun construction resembles information, which is ordinarily singular and uncountable. Writers do not normally say “an information” or “informations”; they say “a piece of information” or “information.” The same logic supports “a piece of data” when the singular mass interpretation is intended.
The plural interpretation behaves more like results or measurements. It permits expressions such as these data, the data were collected, and, in highly formal prose, the data are insufficient. In ordinary speech, those forms can sound marked because many readers have learned data as a collective technical noun.
Does the Meaning Change the Grammar?
Yes. The verb can reveal what the writer believes the noun represents. Compare these sentences:
- “The data are the individual readings from 40 sensors.”
- “The data is the complete sensor feed for the building.”
- “The data were analyzed separately.”
- “The data was imported into the analytics platform.”
The first and third examples foreground units. The second and fourth foreground a system-level resource. Neither interpretation makes the underlying numbers different; the grammatical framing changes.
A practical test is to substitute a clearer noun. If measurements, observations, or results fits, plural agreement is defensible. If information, content, or the data set fits, singular agreement is often natural.
What Is the Singular of Data?
The traditional singular of data is datum, but modern writers usually say data point or piece of data instead. A datum is grammatically correct, especially in statistics, mathematics, and formal academic writing, but it is uncommon in ordinary technical communication.
| Intended meaning | Preferred expression | Example |
|---|---|---|
| One recorded value | a data point | One data point was excluded |
| One item of information | a piece of data | A piece of data was corrupted |
| One research observation | an observation | One observation was unusual |
| One measured result | a measurement | One measurement was repeated |
| Traditional Latin-derived singular | a datum | A datum was entered manually |
| One geographic reference system | a datum | The map uses a horizontal datum |
“A data” is generally incorrect when the writer means one item. Use a data point, a datum, or a piece of data instead.
The word datum also has a specialized geographic meaning. In surveying, a horizontal datum defines a reference surface for positioning, while a vertical datum supports elevation measurements. In that field, the plural datums is accepted for distinct geodetic reference systems, although data may also appear in broader technical language.
Is Datums Ever Correct?
Datums is correct in geodesy and surveying when it means multiple reference systems. For example, “The software converts coordinates between two geodetic datums” is standard specialist usage. For ordinary facts or digital records, datums is not the normal plural of datum in general English.
This distinction prevents a common editing error. A database does not normally contain “thousands of datums”; it contains thousands of data points, records, or values. A mapping application may legitimately support “three geodetic datums.”
When Should You Use Data Is or Data Are?
Use data are when a formal audience expects research observations to be treated as countable items, and use data is when data functions as one information resource. The strongest choice also follows the publication’s house style, because disciplinary convention can override a writer’s personal preference.
| Writing situation | Usually preferred form | Example | Reason |
|---|---|---|---|
| Peer-reviewed biology paper | data are | The data are reproducible | Individual findings |
| Statistical methods report | data were | Data were normalized | Observations or records |
| Software documentation | data is | The data is cached locally | Stored resource |
| Business dashboard | data shows | The data shows a decline | Unified display |
| Newspaper article | data is or are | The data is available | Publication style |
| Legal or regulatory filing | style-dependent | The data are attached | Formal institutional register |
| Marketing report | data is | Customer data is segmented | Aggregate resource |
| Survey results | data show | The data show a preference | Results produce evidence |
The table describes tendencies, not laws. The Associated Press generally permits singular treatment when data acts as a collective mass, while scientific and academic publications often retain plural agreement. The APA Publication Manual, discipline-specific journal instructions, Chicago Manual of Style, and IEEE editorial requirements should be checked in their current editions because recommendations and examples can change.
What Does APA Style Require?
APA-oriented psychology and behavioral-science writing commonly uses plural agreement when data refers to research findings. A sentence such as “The data were analyzed using a hierarchical model” fits the formal research register and avoids ambiguity about separate observations.
APA guidance should not be reduced to a universal command that every appearance of data must take a plural verb. A manuscript may discuss a database or an information system, where singular treatment can represent a different meaning. Authors should also follow the target journal’s instructions, because journal style can refine or supersede a general manual.
What Does Chicago Style Allow?
Chicago style recognizes that data may function as either plural or singular, with the surrounding meaning and audience guiding the choice. Chicago-oriented general prose often accepts singular usage because it matches current English, while scholarly scientific prose may retain data are.
The editorial priority is coherence. A report that begins with “the data are reliable” and later says “the data is archived” should either explain the semantic shift or standardize the construction. Unexplained switching looks like proofreading failure, even when both forms are individually defensible.
What About AP and IEEE?
AP-style news writing commonly accepts singular data in general reporting, while IEEE and engineering research often favor plural data in formal papers. Technology teams, however, frequently use singular agreement in documentation, product specifications, and software conversations.
The important boundary is publication context. An engineer may write “the data is serialized” in API documentation and “the data are statistically significant” in a journal article without making a grammatical mistake. Each sentence frames data differently and addresses a different readership.
Is Data Countable or Uncountable?
Data can be countable or uncountable in English. Countable data refers to separate pieces, observations, or measurements; uncountable data refers to an aggregate quantity of information. The choice determines whether expressions such as many, few, much, or little sound appropriate.
| Construction | Noun type | Natural example | Less suitable replacement |
|---|---|---|---|
| many data points | countable units | Many data points were removed | many data |
| few observations | countable units | Few observations remain | few data |
| much data | mass information | The model processes much data | many data |
| little data | mass information | Little data is available | few data |
| several records | countable units | Several records failed validation | several data |
| a large data set | named collection | A large data set was uploaded | a large data |
In careful modern prose, many data and few data are possible but can sound formal or awkward. Replacing them with many data points, few observations, or a small number of records usually improves readability without changing the meaning.
The noun data set introduces another useful option. Because set is countable and singular, writers can say “the data set is complete” or “the data sets are incompatible,” avoiding a dispute over the number of data itself.
How Do Compound Phrases Affect Agreement?
A compound phrase such as user data or customer data does not change the grammatical number of data by itself. The main noun remains data, so agreement depends on whether the phrase denotes an aggregate resource or separate items.
| Compound phrase | Common interpretation | Typical agreement | Example |
|---|---|---|---|
| user data | stored account information | singular | User data is encrypted |
| experimental data | research observations | plural | Experimental data are limited |
| sales data | business information | singular or plural | Sales data shows a decline |
| climate data | measurements over time | plural in research | Climate data indicate warming |
| metadata | descriptive information | singular or plural by style | Metadata is embedded |
| big data | large information environment | singular | Big data is expensive to manage |
Certain compounds have strong field conventions. Big data is is overwhelmingly natural when the phrase names a technological field or resource. Experimental data are remains common because researchers often mean a body of observations produced by experiments.
Modifiers do not settle the question. The writer still needs to identify whether the sentence focuses on storage, analysis, measurement, or individual values.
Is Metadata Singular?
Metadata is commonly treated as a singular mass noun in software and information-management writing. “Metadata is attached to the file” is natural because metadata means descriptive information. Academic cataloging and library contexts may use plural agreement when individual metadata elements are being discussed, but singular is the ordinary technical default.
The same reasoning applies to medical data, financial data, and customer data. A security policy may say “customer data is encrypted,” while a study may say “the patient data were collected at three hospitals.” The domain does not mechanically determine agreement; the intended unit does.
How Should Scientists Write Data Agreement?
Scientists should normally use plural agreement when data means observations or results, unless a journal’s style guide specifies otherwise. “The data are consistent with the hypothesis” and “The data were collected over six months” fit conventional scientific prose.
Plural agreement offers a useful analytical distinction. It reminds readers that evidence consists of observations with possible variation, missing values, measurement error, and sampling limits. That framing is especially useful when a paragraph discusses data quality, replication, distributions, or statistical tests.
Singular agreement is not automatically scientifically wrong. A methods section can accurately say “The data set is publicly available,” because data set is singular. A computational paper can also say “The data is stored in a relational database” when it treats the information as a system resource. Precision comes from matching grammar to the referent.
Why Do Academic Editors Prefer Data Are?
Academic editors often prefer data are because scientific data historically represents multiple observations, and plural agreement preserves that analytical framing. The preference also reflects disciplinary convention, reviewer expectations, and the influence of Latin-derived terminology.
That preference is strongest in research sentences containing verbs such as show, indicate, support, suggest, and demonstrate:
- “The data indicate a lower error rate.”
- “The data support the proposed mechanism.”
- “The data suggest that temperature affected yield.”
A journal may still permit singular agreement in general prose. Authors should search recent articles from the target publication, then apply the observed convention consistently.
How Should Developers and Businesses Write Data Agreement?
Developers and business writers usually use singular agreement when data means an information asset, feed, file, or system resource. Examples include “The data is available through the API,” “Customer data has been migrated,” and “The data was backed up overnight.”
Singular usage is particularly clear when the sentence concerns operations performed on an aggregate:
- Data is encrypted.
- Data has been replicated.
- Data was exported.
- Data is subject to retention rules.
Plural agreement becomes useful when the sentence concerns individual records or measured values:
- The data are inconsistent across sites.
- The data show three outliers.
- The data were entered by different operators.
A practical developer rule is to use records, rows, values, or measurements when count matters. “The 4,000 records were validated” is more informative than “The data were validated,” regardless of the chosen style.
Should You Replace Data With Information?
Replace data with information when the material is already interpreted, summarized, or presented for general readers. Retain data when the material consists of raw measurements, records, values, or machine-readable inputs that may support later analysis.
| Intended content | Better term | Example |
|---|---|---|
| Raw sensor readings | data | Sensor data were sampled at 1 Hz |
| Interpreted business result | information | The information is useful to managers |
| Individual database entries | records | The records were deduplicated |
| Numeric measurements | observations | The observations were excluded |
| Charted values | measurements | The measurements show drift |
| One reported value | data point | One data point exceeded the limit |
The substitution can improve both grammar and comprehension. “The data shows that churn increased” may become “The analysis shows that churn increased,” which identifies the actor more precisely. “The data is confidential” may remain the best choice when the policy covers an entire information category.
Do not replace every occurrence mechanically. In data science, data has a technical meaning that information may not preserve. Raw data can be incomplete or uninterpreted; information usually implies organization or meaning.
How Can You Keep Data Agreement Consistent?
Use one grammatical pattern for the same meaning within a document, then change the noun when the referent changes. A five-step edit takes roughly 5-10 minutes for a short report and prevents most agreement errors.
- Mark every occurrence of data. Search for data, datum, data point, and compound forms such as customer data.
- Classify each use. Label each instance observations, records, information resource, or named data set.
- Choose the house style. Check the journal, publisher, client, or internal editorial guide before changing verbs.
- Check nearby modifiers. Match many/few with countable units and much/little with mass usage.
- Read the paragraph aloud. Look for switches such as “the data is … they show …” and replace unclear nouns.
You will know the edit worked when every verb agrees with the intended meaning and no sentence requires the reader to infer whether data means records or an information system. A common mistake is to change only the verb while leaving a mismatched pronoun or modifier.
What Is the Most Reliable Editing Pattern?
Use one of these patterns:
- Plural pattern: “The data are incomplete, and they show substantial variation.”
- Singular pattern: “The data is incomplete, and it shows substantial variation.”
- Clarified pattern: “The data set is incomplete, and the measurements show substantial variation.”
The third pattern often produces the clearest professional prose. It separates the container, data set, from the contents, measurements, so the reader understands both the collection and its individual elements.
Common Mistakes With Data
Most errors involve mixed agreement, incorrect singular forms, or an unexplained switch between raw observations and aggregate information. The following corrections address the failures that appear most often in reports, websites, software documentation, and research manuscripts.
| Mistake | Problem | Correct revision | Context |
|---|---|---|---|
| The data is, and they show | Singular verb with plural pronoun | The data are, and they show | Plural research use |
| The data are encrypted | Formal plural for a system resource | The data is encrypted | Technical documentation |
| A data was deleted | Incorrect singular article | A data point was deleted | One value |
| Many data is missing | Mixed number and agreement | Many data points are missing | Countable items |
| Several datums were analyzed | Wrong field-specific plural | Several data points were analyzed | General research |
| The data were uploaded to the server | Possible semantic mismatch | The data was uploaded | Aggregate file or resource |
One counterintuitive point matters: plural agreement is not always more precise. “The data are stored in the cloud” can suggest that individual observations are independently stored, although the writer means one collection. “The data is stored” may communicate the system-level meaning more accurately.
Another practitioner rule is to avoid forcing datum into ordinary prose. Readers understand data point immediately, whereas datum can sound archaic outside statistics, mathematics, or geodesy.
What If a Client Demands One Form?
Follow the client’s documented style when both forms are grammatically defensible, then apply it consistently. If the client has no rule, recommend singular for general business and software writing or plural for formal research writing, and record that choice in the project style sheet.
Do not silently normalize quotations, legal names, or source titles. Preserve the original wording when accuracy requires it, then explain the variation in surrounding prose if the difference could confuse readers.
Which Form Should You Choose?
Choose plural data for formal scientific findings, singular data for aggregate technical information, and a clearer substitute when the meaning could be misunderstood. The following decisions cover the main audiences.
For Academic Researchers
Use data are and data were when discussing observations, analyses, or results, unless the journal’s author instructions require another convention. Use data set is for one named collection.
For Software Engineers
Use data is for storage, transmission, encryption, serialization, and APIs. Use records are, values are, or data points are when individual units matter.
For Business Writers
Use data is for dashboards, customer information, and organizational resources. Use results show or the figures indicate when a report interprets the underlying material.
For Students
Match the instructor’s or department’s style. If no instruction exists, use data are in a formal research paper and explain individual items as data points rather than datums.
For Geographers and Surveyors
Use datum and datums for geographic reference systems. Do not transfer that specialized plural into ordinary references to facts, records, or measurements.
FAQ
Is “the data is” grammatically wrong?
No. The data is is grammatical when data functions as a singular mass noun meaning an information resource or collection. Many technology, business, journalism, and general-English contexts use it routinely. Scientific publications may prefer the data are, especially when the sentence refers to separate observations or results.
Is “the data are” outdated?
No. The data are remains current and conventional in scientific, statistical, medical, and academic writing. It is not outdated merely because singular agreement is common elsewhere. The form is most appropriate when the writer emphasizes measured values, experimental results, or multiple observations.
What should I write in a research paper?
Write data are or data were when discussing research observations, unless the journal or instructor specifies singular agreement. Use the data set is when referring to one collection as an object, and use data points, measurements, or observations when the number of items matters.
Can data be used with a singular adjective?
Yes. A singular adjective may modify an aggregate phrase without deciding verb agreement. For example, the available data are limited treats data as plural, while the available data is stored securely treats it as a mass noun. The adjective available does not determine the noun’s grammatical number.
Is data always uncountable in technology?
No. Technology writing often treats data as uncountable, but technical authors also count data sets, records, fields, values, and data points. “The database contains 2 million records” is more precise than “the database contains 2 million data,” which is generally unnatural.
What is the best neutral alternative?
Data set is usually the best neutral alternative for one organized collection. Information works for interpreted or general material, while records, measurements, observations, and data points identify specific units. Choose the noun that tells readers what the material actually contains.
The Bottom Line
Is data singular or plural? Both forms are correct in contemporary English. Use data are for separate scientific observations and data is for an integrated information resource, while following the relevant style guide for formal publication. In the conclusion, clarity comes first: name the unit, keep agreement consistent, and do not let Latin origin override meaning.
