Hi, I have sample of 40,000 observation grouped into 2 response groups (responders = 1000). Number of explanatory variables=55 While using prog logistic, i get possible quasi complete separation. When i drop to a subset of 50 this problem goes, again a different set of 50 brings back this problem! 0) Why does this problem happen? 1) Is there a way to detect which variables cause this problem? 2) How can i get rid of it?
Any help and detailed help will be **really** appreciated. Thanks Sapsi . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
