The HPSAMPLE Procedure
The following statements are available in the HPSAMPLE procedure:
PROC HPSAMPLE
<options> ;
VAR
variable <variable ... variable> ;
CLASS
variable <variable ... variable> ;
TARGET
variable <variable ... variable> ;
PERFORMANCE
performance-options ;
Either a VAR or a CLASS statement is required for simple random sampling; both the CLASS and TARGET statements are required for stratified sampling.