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...ter than zero. I have been looking at other posts about this but I haven?t understood how I should act when the separation (or quasi separation) is not a statistical artifact but it is something real. As suggested in http://r.789695.n4.nabble.com/OT-quasi-separation-in-a-logistic-GLM-td875726.html#a3850331 http://r.789695.n4.nabble.com/OT-quasi-separation-in-a-logistic-GLM-td875726.html#a3850331 (the last post is mine) I tried to use brglm procedure that uses a penalized maximum likelihood but it made no difference. What would you do if you were in my shoes? Thanks in advance for any help. Simone...