PROC SURVEYSELECT Statement :: SAS/STAT(R) 14.1 …
https://support.sas.com/documentation/cdl/en/statug/68162/HTML/default/statug_surveyselect_syntax01.htm
The PROC SURVEYSELECT statement also specifies the sample selection method, the sample size, and other sample design parameters. If you do not specify a selection method, PROC SURVEYSELECT uses simple random sampling ( METHOD=SRS ) by default unless you specify a SIZE statement or the PPS option in the SAMPLINGUNIT statement.
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