STRATA Statement

The SURVEYREG Procedure

STRATA Statement

STRATA $\, | \,$ STRATUM variables < / options > ;

The STRATA statement specifies variables that form the strata in a stratified sample design. The combinations of categories of STRATA variables define the strata in the sample.

If your sample design has stratification at multiple stages, you should identify only the first-stage strata in the STRATA statement. See the section "Details" for more information.

The STRATA variables are one or more variables in the DATA= input data set. These variables can be either character or numeric. The procedure uses only the first 16 characters of the value of a character variable. The formatted values of the STRATA variables determine the levels. Thus, you can use formats to group values into levels. Refer to the discussion of the FORMAT procedure in the SAS Procedures Guide.

You can use multiple STRATA statements to specify stratum variables.

You can specify the following options in the STRATA statement after a slash (/).

LIST: displays a "Stratum Information" table, which includes values of the STRATA variables, and the number of observations, number of clusters, population total, and sampling rate for each stratum. This table also displays stratum collapse information.
NOCOLLAPSE: prevents the procedure from collapsing, or combining, strata that have only one sampling unit. By default, the procedure collapses strata that contain only one sampling unit. See the section "Stratum Collapse" for details.

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