topic proc psmatch in Statistical Procedures

proc psmatch

fkamkar — Sun, 13 Aug 2023 02:35:40 GMT

I need to match my dataset based on Marketcap , I used this code and I constantly get the error of "the support frgion does not exist.

proc psmatch data=propensity_scores region=cs;

class Nonover;

psmodel Nonover(treated='Yes')= overlap Marketcap;

match method=optimal(k=1) stat=lps caliper=0.25;

output out(obs=match)=outEx1 matchid=_matchID;

run;

here is the code I used .

is there anyone can help me please

Re: proc psmatch

JosvanderVelden — Tue, 15 Aug 2023 10:15:15 GMT

You might try REGION=ALLOBS and see if you get the same error message.
For details see post: https://communities.sas.com/t5/Statistical-Procedures/Support-region-error-message-propensity-score-matching-using/td-p/643425

Re: proc psmatch

MichaelL_SAS — Tue, 15 Aug 2023 16:42:20 GMT

As noted in the thread @JosvanderVelden linked to, it is likely the case that there is no overlap between the predicted propensity score values. I believe PROC PSMATCH doesn't produces any output when this error is encountered, but you can check this by fitting the same propensity score model in PROC LOGISTIC and see investigate using the predictions it produces. I suspect PROC LOGISTIC will report some issues regarding complete/quasi-complete separation for these data.

Re: proc psmatch

fkamkar — Tue, 15 Aug 2023 16:53:51 GMT

Thank you very much for replying, is it possible if you can give me the whole code for Proc Logistic? I tried it but still get errors