Sample survey: The survey in which data is collected by inspected units of sample is known as sample survey. For example, counting of votes after election For example, census data cannot be collected by an individual or research organization, but can be obtained from government publications.Ĭensus: The survey in which data is collected by inspecting all units of the population is known as census. Data are said to be secondary when these are collected from published or unpublished data which have already been collected and processed by some other agency or person. Data are said to be primary when these are collected originally by an investigator or agency. Data obtained from external sources may be primary or secondary. Similarly, a company wants to forecast the future sales of its products, and then they must refer the previous records.Įxternal sources: Sometimes data may not depend upon the internal sources but it depend upon the outside the sources. Here data depends upon the internal sources. We collect this information within the school. Then we collect the data about the marks of students in all subjects. Internal sources: Suppose we want to find out the ranks for 10th class students in a school. Data sources are divided into three categories: internal sources, external sources and surveys and experiments.
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