PROC SURVEYSELECT: Overview :: SAS/STAT(R) 9.22 User's …
https://support.sas.com/documentation/cdl/en/statug/63347/HTML/default/statug_surveyselect_sect001.htm
PROC SURVEYSELECT selects the sample and produces an output data set that contains the selected units, their selection probabilities, and their sampling weights. When you select a sample in multiple stages, you invoke the procedure separately for each stage of selection, inputting the frame and selection parameters for each current stage.
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