Hi, Hoping someone might be able to help me with the above warning message. I have a dataframe with 7 covariates. 6 out of the 7 run without any issues, but any matching method run involving the 7th returns the following message; "Warning message: glm.fit: fitted probabilities numerically 0 or 1 occurred" I've googled the above and despite some fairly detailed explanations I'm none the wiser as to how to progress. The variable is numerical. Sample as follows: "[1] 42.108184 1.925875 42.108184 3.540687 2.331532 2.331532 2.781410 2.781410 1.701947 1.701947 [11] 1.701947 1.701947 1.701947 1.966572 1.966572 10.994199 0.000000 0.748349 3.666423 3.666423 [21] 3.666423 3.666423 0.746897 2.046640 1.019349 0.371999 1.019349 0.208058 0.194368 0.194368 [31] 0.952280 0.952280 0.952280 1.202849 1.202849 1.361906 1.361906 1.694844 0.618513 1.361906 [41] 1.361906 1.361906 0.304016 0.304016 0.641256 0.641256 0.641256 0.234019 0.641256 0.641256" Any suggestions would be very much appreciated. Cheers, Anthony Anthony Dancer Imperial College London Silwood Park Campus Buckhurst Road Ascot SL5 7PY t: +44(0) 7968 836 451 e: anthony.dancer09(a)imperial.ac.uk s: anthony.dancer1 - --- MatchIt mailing list served by HUIT List Address: matchit(a)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(a)lists.gking.harvard.edu To unsubscribe from this list or get other information: https://lists.gking.harvard.edu/mailman/listinfo/matchit