• Secondary (Secondary Data) is information that the user does not collect it. But there are others, Other agencies As already collected from reports printed or not printed. Government agencies, associations, research firms, researchers, journals, newspapers, etc., bringing these data to save time and cost. But sometimes the information may not match the needs of the user. Or are not detailed enough to be analyzed. Also, sometimes Information that may have errors, and users are often not aware of such errors. This could affect the results, so who will be secondary to be careful and check the quality before data would be analyzed
addition, users will not be aware of the pitfalls of data. Which may be made to adopt. Conclusions go wrong with such a motorcycle accident statistics by the students in the year 2540 - 2541 as the data may be processed already. But sometimes due to our inability to collect primary data, so we have to study the data that is already collected.
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