SAS propensity score matching procedure

proc psmatch data=psm region=cs;
where &outcome ne .;
class FLAGĀ  districtname SCHOOLNAME ;
psmodel FLAG(Treated=”Y”)= &exactvar &predictors;
match method=greedy(k=1)/*(order=random)*/ exact=districtname stat=lps caliper=&caliper;
output out(obs=match)=outgs lps=_Lps matchid=_matchID;
run;
proc sort data=outgs;by _matchID;run;

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