[R] Something changed and glm(..., family=binomial) doesn't work now

From: Philip Riggs <priggs_at_warnercnr.colostate.edu>
Date: Sat 18 Feb 2006 - 10:40:58 EST


I ran logistic regression models last week using glm (...,family=binomial) and got a set of results. Since then I have loaded the Epi package for ROC analysis. Now when I run those same models I get completely different results, with most being:

Warning message:
fitted probabilities numerically 0 or 1 occurred in: glm.fit(x = X, y = Y, weights = weights, start = start, etastart = etastart,

I didn't get this result last week. Also, the ROC function in Epi is no longer working (giving a ROC of 1.000). What would have changed to cause this and how can I fix it?

p.s. To check I ran the same model in S and have the same result as last week.

Philip



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