Hi All, Sorry if this seems obvious, I'm new to R. I've run nearest-neighbour matching in MatchIt for three different treatment groups. By this I mean, I have three separate treatments, each with a different control group. I want to combine the MatchIt outputs so that I can estimate treatment effects for all three treatments together. I want to retain the current matched pairs as they are. Any ideas? Thanks, Louise -- View this message in context: http://r.789695.n4.nabble.com/Combining-multiple-MatchIt-outputs-tp3325254p3325254.html Sent from the R help mailing list archive at Nabble.com.