secondary data

secondary data2016-12-14T22:20:16+00:00

secondary data 


A term of art for data collected for purposes other than for a formal study or trial.*

Because the investigator has no control over case definition, collection procedures, observers (clinicians) or other opportunities for measurement bias reduction, the potential for bias of secondary data is substantial.

*Secondary data has also been defined as data collected by a person who is not the user.

Examples Clinical records, which may be used for case-control studies; organisational records; consensus data. 

Pros Cheaper; more readily available than primary data.

Cons Potential for significant measurement bias. 



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