Sources of information (source of data)
My statistics may be classified according to two sources, ie
.• primary data (primary data) is the data that the user or the user is collected manually. This method may be used for data collection, interviews, experiments or observations.But often time consuming and costly to supply
.• Secondary data (secondary data) is the data that the user does not collect it. But the others? Other agencies Collected, such as a printed report or has not printed. Government agencies associatedResearchers, journals, newspapers, etc., bringing these data to save time and cost. However, sometimes information may not match the needs of the user. Or are not detailed enough to be analyzed.Information may contain errors and users are often not aware of such errors. Which may affect the results, so the secondary information to be used carefully and check the data before it is analyzed
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