Three ways Propensity Score Matching

[heo1981]

Hello.

I am looking for the way how to match three groups using propensity score matching.

There are three groups, and I want to match via 1:1:1, or 2:1:1

Could you please help for that?

Any kinds of resource or code will be great help for me!

Thank you.

[ChrisHemedinger]

Check this SAS Global Forum paper and see if it helps:

A General SAS® Macro to Implement Optimal N:1 Propensity Score Matching Within a Maximum Radius

It includes plenty of how-to advice around PROC LOGISTIC.

[StatDave]

Also, check out PROC PSMATCH (new in SAS 9.4 TS1M4) which can do propensity score matching.