Hi Jay, The $match.matrix part of the matchit output will give you that information. See this page: http://r.iq.harvard.edu/docs/matchit/2.4-20/Output_Values.html Liz On Jan 13, 2015, at 5:51 PM, Jay <jayodita@grandroundshealth.com<mailto:jayodita@grandroundshealth.com>> wrote: Hi, I am using Matchit for propensity matching, and would like to know which control instances are being matched to each treatment instance. Is there an easy way to output this? Thanks!! - --- MatchIt mailing list served by HUIT List Address: matchit@lists.gking.harvard.edu<mailto:matchit@lists.gking.harvard.edu> Subscribe/Unsubscribe: http://lists.gking.harvard.edu/mailman/listinfo/ei MatchIt Software and Documentation: http://gking.harvard.edu/matchit/ Browse/Search List Archive: http://lists.gking.harvard.edu/mailman/private/matchit/ Matchit mailing list Matchit@lists.gking.harvard.edu<mailto:Matchit@lists.gking.harvard.edu> To unsubscribe from this list or get other information: https://lists.gking.harvard.edu/mailman/listinfo/matchit