10-poststratified - Post-Stratification(Stratification...

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1 10-Post-Stratification (Stratification after the selection of sample) 1 Post-Stratification (Stratification after the selection of sample) y Stratified sampling presupposes the knowledge of the stratum sizes as well as the availability of a frame for drawing a sample in each stratum. y But normally the frame is not available. y Consequently, it is not possible to know in advance to which stratum a sampling unit belongs until it is contacted in the course of the survey itself. y While the sample might be selected by some sampling schemes, it is always possible to classify the selected sample by the strata and treat it as if it were a stratified sample. 2 Post-Stratification (Stratification after the selection of sample) Suppose sample is selected by simple random sampling without replacement. Let n h be the number of units in the sample that are in the h th stratum. Let y hj be the measurement of the j th unit that is in the h th stratum.
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