A common solution to this problem is using stratified random sampling. In stratified random sampling, one splits the population into non-overlapping groups (e.g., under 30 years of age, 30 years and ...
The method of simple random sampling (METHOD=SRS) selects units with equal probability and without replacement. Each possible sample of n different units out of N has the same probability of being ...
The PROC SURVEYSELECT statement invokes the procedure and optionally identifies input and output data sets. If you do not name a DATA= input data set, the procedure selects the sample from the most ...
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