The U.S. Environmental Protection Agency (EPA) finalized Test Methods 1633 and 1621, environmental sampling methods for analyzing up to 40 target per- and polyfluoroalkyl substances (PFAS) in soil, ...
If you specify the option METHOD=SEQ and do not include a SIZE statement, PROC SURVEYSELECT uses the equal probability version of Chromy's method for sequential random sampling. This method selects ...
PROC SURVEYSELECT provides a variety of methods for selecting probability-based random samples. With probability sampling, each unit in the survey population has a known, positive probablity of ...
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