[R-sig-ME] working around glm.fit: "fitted probabilities numerically 0 or 1 occurred"

S Ellison S.Ellison at LGCGroup.com
Fri Aug 24 12:43:39 CEST 2012

This does not necessarily mean the fit has not converged; it is usually just a warning that some predicted probabilities at some point during the process of fitting were so close to 0 or 1 that they cannot be properly represented in finite precision arithmetic. That does not, of itself, prevent convergence, and you have already nicely demonstrated that the problem occurred on early iterations but not later, better, estimates.

Are you sure you need to work round it?


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