Stratum Information

When you specify the LIST option in the STRATA statement, PROC SURVEYLOGISTIC displays a "Stratum Information" table, which provides the following information 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 nonmissing observations in the stratum.

• N Obs, which is the number of observations

• number of Clusters, if you specify a CLUSTER statement