Bias.
Errors of definition .
Substition.
Arrithmetical errors.
In adequacy in size.
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primary data is where you get o fact off a computer or from a book secondary data is where you get a fact of someone and it might not be true
Primary data is data that is collected by the researcher. Secondary data is information that has been collected by someone other than the user.
Primary data is the the data that collected by yourself. While secondary data is those collected by others and to be reused by yourself.
Secondary - unless it is something was published based on data that you yourself collected..
The difference between primary data and secondary data is that primary data is the information from the original research.