"Because Bernoulli sampling is based on a specified inclusion probability instead of a fixed sample size, METHOD=BERNOULLI does not use the SAMPSIZE= option." This sentence is what confused me. I did run SURVEYSELECT on the Cars data set twice and drew 21 and 29 samples. The two SAMPLE files had 428 records each (as did the input file) but the "Selected" columns of the two had "1"s in different rows and different numbers of "1"s. So a twenty sided die is thrown 428 times for each run. In contrast, SRS has skip intervals or draws a random number SAMPLESIZE times and selects the corresponding records. I'm comfortable now, thanks. .
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