A simple random sample is a subset of a statistical population where each member of the population is equally likely to be ...
The method of systematic random sampling (METHOD=SYS) selects units at a fixed interval throughout the sampling frame or stratum after a random start. PROC SURVEYSELECT chooses the first unit randomly ...
If you specify the option METHOD=PPS_SYS, PROC SURVEYSELECT selects units by systematic random sampling with probability proportional to size. Systematic sampling selects units at a fixed interval ...
Stratified random sampling is a method of sampling that divides a population into smaller groups that form the basis of test ...
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