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In sampling surveys, the deliberate selection of a larger proportion of subjects in one or more strata than in others, with specific aims, such as attempting to ensure that relatively uncommon events or conditions are not overlooked if a suspicion exists that these might occur more often in such strata than in others. In surveys, overrepresentation can help to ensure that if there is substantial loss to followup enough subjects remain to permit valid analysis.

Subjects: Public Health and Epidemiology.

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