What are the disadvantages of secondary data analysis?

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A major disadvantage is that it may not include the specific information the researcher wants. Or it may not have been collected from the specific population the researcher is interested in. Another disadvantage is that the researcher/analyst didn’t participate in the survey design and data collection process, so that they may misinterpret the data.
In addition, often time the accessibility of secondary data is limited. It is difficult for researchers to get full access to a reliable and complete dataset from other agencies.