If you specify the option METHOD=PPS_SYS, PROC SURVEYSELECT selects units by systematic random sampling with probability proportional to size. Systematic sampling selects units at a fixed interval ...
PROC SURVEYSELECT provides a variety of methods for selecting probability-based random samples ... proportional to size (PPS): PPS sampling without replacement, PPS sampling with replacement, PPS ...
With systematic sampling you can then select the points to monitor but this can introduce bias. Random sampling eliminates bias by generating the points randomly. Now you need sampling tools.
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