The phrase "primary data is" is correct and usable in written English.
You can use it when referring to factual information that has been gathered directly from its source, rather than being inferred from secondary sources. For example, "Primary data is often collected through surveys, interviews, and experiments."
Exact(45)
The only way providers get to see a lot of primary data is through interactions with the pharmaceutical industry.
The advantages afforded by the internet mean that primary data is becoming available freely online.
Primary data is the original data collected for a specific purpose by or for an investigator.
Collecting primary data is expensive and time-consuming, and it usually is undertaken only when secondary data is not available.
Primary data is collected through a survey questionnaire.
The Suc means that the primary data is successfully delivered in a certain case.
Similar(15)
Primary data was mainly cross-sectional.
Primary data was collected using semi-structured questionnaires.
Primary data were collected from the study area.
The primary data were collected through household surveys.
A total of 320 papers containing primary data were included.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com