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Primary sources are also sets of data, such as health statistics, which have been tabulated, but not interpreted. 1  Journals or Periodicals: main type of publication in which scientific research is reported. 2  May be published by learned societies or by commercial publishers. 3  A researcher(s) submits an article to a journal.
A: Primary data is original research that is obtained through first-hand investigation, while secondary data is research that is widely available and obtained from another party. Primary data includes information collected from interviews, experiments, surveys, questionnaires, focus groups and measurements.