Data that has been collected for some other purpose than to answer the question at hand is called secondary data.
Secondary data is data collected for research that has been gathered previously and can be accessed by researchers.
The term also contrasts with primary data means the data which is data collected directly from its source.
Secondary data is always used to increase the sampling size of research studies.
Secondary data is also chosen for its efficiency and the speed that comes with using an already existing resource.
Secondary data helps in large research projects, in which different research groups work in teams to collect secondary data. The main researcher is then focuses on primary research or particular areas of interest.
Common sources of secondary data includes data collected by government public services departments, different libraries, websites over the internet and censuses.
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