Which term describes data that are collected for the study for the first time?

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Data collected for the study for the first time are called primary data. This means the researchers generate or gather new information specifically to answer their current research question, using methods like surveys, experiments, interviews, or direct observations. Collecting data firsthand gives the investigators control over what is measured, how it is measured, and when it is measured, which helps ensure the data are directly relevant and of high quality for the study.

In contrast, secondary data already exist from previous studies, reports, or records and were not collected with the current question in mind. Relying on these data can introduce limitations related to how they were collected, their age, or whether they fit the current definitions and units of analysis. Tertiary and quaternary are not standard terms for the data collected in a study; they typically refer to methods of sourcing or compiling information beyond the primary data, rather than data gathered anew.