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Tag Archives: retrospective-prospective study design

Types of Study Design: The Reference Period

On the basis of the reference period, the study designs can be categorized into retrospective, prospective and retrospective-prospective study designs Retrospective The aim behind retrospective study design is to study some event, phenomenon or situation that has been happened previously. There are only two ways to collect data for a retrospective study: either the investigator collects information from written evidence like from books, magazines, …

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