The PSMATCH Procedure

CLASS Statement

CLASS variables;

The required CLASS statement specifies the following input variables that are used as classification variables:

the variable to use as the treatment indicator in the PSDATA and PSMODEL statements
the classification covariates in the logistic model in the PSMODEL statement
the classification variables that are specified in the VAR= option in the ASSESS statement

If a PSMODEL statement is specified, the CLASS statement must precede the PSMODEL statement. Classification variables can be either character or numeric.