PROC SURVEYSELECT: PPS Sampling without …
https://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/statug_surveyselect_a0000000157.htm
PPS Sampling without Replacement. If you specify the option METHOD=PPS, PROC SURVEYSELECT selects units with probability proportional to size and without replacement. The selection probability for unit in stratum equals , where is the sample size for stratum , and is the relative size of unit in stratum . The relative size equals , which is the ratio of the size measure …
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