Simple, Primary and Secondary Data
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Two sources of data could be primary sources and secondary sources. Primary sources refer to the original data that has been collected firsthand, such as surveys, experiments, or observations. Secondary sources, on the other hand, are already processed or interpreted data, such as books, articles, or databases, that analyze and present information from primary sources.
some sources of data are information
national sample survey
The Census.The civil registration system.Administrative records.
To compare data from different sources.
Non-scientists provide additional sources of data that scientists can use.