_______ is a a two-stage process in which the target population is partitioned into subpopulations (so called strata)The elements within a stratum should be as homogenous as possible, but the elements in different strata should be as heterogeneous as possible.The stratification variables should also be closely related to the characteristic of interest+Includes all important subpopulations, high precision-Difficult to select relevant stratification variables, not feasible to stratify on many variables, time consuming

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