Selective attrition (the problem that some of the subjects in a study may drop out before the study is completed) is a complication in which kind(s) of study?

Question

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Selective attrition is a complication in longitudinal studies where subjects are followed over a period of time. In cross-sectional studies, all data is collected at one point in time, so selective attrition is not relevant. However, in longitudinal studies, subjects may drop out for various reasons, which can bias the results and compromise the validity of the study.

Selective Attrition (The Problem That Some of the Subjects in a Study