Stratum Information

If you specify the LIST option in the STRATA statement, PROC SURVEYMEANS displays a "Stratum Information" table. This table displays the number of valid observations in each stratum, as well as the number of nonmissing stratum observations for each analysis variable. The "Stratum Information" table provides the following for each stratum:

• Stratum Index, which is a sequential stratum identification number

• STRATA variable(s), which lists the levels of STRATA variables for the stratum

• Population Total, if you specify the TOTAL= option

• Sampling Rate, if you specify the TOTAL= or RATE= option. If you specify the TOTAL= option, the sampling rate is based on the number of valid observations in the stratum.

• N Obs, which is the number of valid observations

• Variable, which lists each analysis variable name

• Levels, which identifies each level for categorical variables

• N, which is the number of nonmissing observations for the analysis variable

• Clusters, which is the number of clusters, if you specify a CLUSTER statement