Even simpler, use surveyselect (dfficult to extend to more than two treatments, see Usage Note http://support.sas.com/kb/23/091.html ) : proc surveyselect data=sashelp.class out=want outall rate=0.25; run; data want(drop=Selected); set want; treatment = ifc(Selected, "Dummy 1", "Dummy 2"); run; PG
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