[R] warnings in glm (logistic regression)

From: Taka Matzmoto <sell_mirage_ne_at_hotmail.com>
Date: Tue 31 Jan 2006 - 19:41:30 EST


Hello R users

I ran more than 100 logistic regression analyses. Some of the analyses gave me this kind warning below.

###########################################################
Warning messages:
1: algorithm did not converge in: glm.fit(x = X, y = Y, weights = weights, start = start, etastart = etastart, ... 2: fitted probabilities numerically 0 or 1 occurred in: glm.fit(x = X, y = Y, weights = weights, start = start, etastart = etastart, ...
###########################################################

For those cases for which I got the warning messages, shouldn't I rely on coefficents ? It looks like I can still extract coefficients from R outputs

Are there any ways to avoid these warning messages ? or are these due to the problems with my data (e.g., perfect separation)

Any help or advice would be appreciated

Thank you

TM



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