Or , assumes your strata is variable is actually character. "No" would come before "Yes" so the first number on the SAMPSIZE list goes with the first strata value, the second with second value and so on. If your Strata variable is actually numeric then make sure you know which value is which so you can get the order correct.
proc surveyselect data = WORK.nps_scrubbed_base_MOB
out= WORK.nps_sample_file_cad_MOB
method= srs
sampsize= (400 100);
strata SEGMENT_MANAGED;
run;
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