Got this error message, and tried the fix from the prior thread but still having problems. I get the same message no matter what list of covariates I use, or even if I switch the treatment variable. . cem totpop_07 netinc_07 disvlg_n distroad_n age edu male ccp prov (#0) if sumindexnew2 ~=., t Matching Summary: ----------------- Number of strata: 1650 Number of matched strata: 0 0 1 . All 1315 668 42 Matched 0 0 0 Unmatched 1315 668 42 imbalance(): 3258 <tmp>[1,1] found where void required <istmt>: - function returned error r(3258); Any suggestions? Many thanks Lily Tsai- -- cem Mailing List, served by HUIT Send messages: cem(a)lists.gking.harvard.edu [un]subscribe Options: http://lists.gking.harvard.edu/?info=cem More information on cem: http://gking.harvard.edu/cem Cem mailing list Cem(a)lists.gking.harvard.edu To unsubscribe from this list or get other information: https://lists.gking.harvard.edu/mailman/listinfo/cem