|What’s New in SAS/STAT 9.22|
The SAMPLINGUNIT statement names variables that identify the sampling units as groups of observations (clusters). The combinations of categories of SAMPLINGUNIT variables define the sampling units. If there is a STRATA statement, sampling units are nested within strata. The NMIN= option in the PROC SURVEYSELECT statement specifies the minimum stratum sample size for the SAMPRATE= option.
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