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A method of adjustment to allow for differences between a study population and a “standard” one, between two or more populations that are being compared, or among any set of variables in which confounding factors might otherwise invalidate comparisons. It can be done in several ways, often by taking different predetermined proportions from several parts of the study population or set of variables, to ensure that numbers in each are sufficient to yield stable rates.

Subjects: Public Health and Epidemiology — Education.

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