For some data sets, PROC PSMATCH fails to generate propensity scores and PROC LOGISTIC is able to generate them using the same model. The PSMATCH procedure issues the following warning, or stops processing and issues these errors in addition to the warning:

To work around the problem, you can use propensity scores computed by PROC LOGISTIC in the PSDATA statement in PROC PSMATCH. For example, suppose this is your PROC PSMATCH code:

Run the same model in PROC LOGISTIC, and save the propensity scores to a data set using an OUTPUT statement:

Then read the propensity score data set and specify a PSDATA statement as follows:

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