[R] Is it possible to use glm() with 30 observations?

From: Kerry Bush <kerryrekky_at_yahoo.com>
Date: Sat 02 Jul 2005 - 12:43:34 EST


I have a very simple problem. When using glm to fit binary logistic regression model, sometimes I receive the following warning:

Warning messages:
1: fitted probabilities numerically 0 or 1 occurred 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,

What does this output tell me? Since I only have 30 observations, i assume this is a small sample problem. Is it possible to fit this model in R with only 30 observations? Could any expert provide suggestions to avoid the warning?



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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat Jul 02 12:48:28 2005

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