What is the difference between primary and secondary data?

Primary data are data that you collect yourself; secondary data are data that others collect.
Primary data are data that other people collect; secondary data are data you collect yourself.
Primary data are data that cannot be used for research; secondary data are data you can use for research.
Primary data are data that you can use for research; secondary data are data that cannot be used for research.

1 answer

The correct distinction is:

Primary data are data that you collect yourself; secondary data are data that others collect.

Primary data is collected firsthand for a specific research purpose or project, while secondary data refers to information that has already been collected and published by others, which can be used for various research purposes.