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 "Specification of Population Totals and Sampling Rates" 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.
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.
