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A sample might be selected from a population in many ways. One is the stratified random sampling method. Stratified random sampling involves dividing the entire population into homogeneous groups ...

The method of ... When you request stratified sampling with a STRATA statement, PROC SURVEYSELECT selects samples independently within strata. The selection probability for a unit in stratum h equals n h /N h for stratified simple random sampling.

If you specify the option METHOD=SEQ and do not include a SIZE statement, PROC SURVEYSELECT uses the equal probability version of Chromy's method for sequential random sampling ... if the design is not stratified). Using this unit as the first one ...