[R] GLM / Logistic Regression Problem

[patsko at gmx.de]

Hi there,

I am encountering a problem with the GLM tool performing logistic regression. After computing a warning appears, saying “glm.fit: fitted probabilities numerically 0 or 1 occurred”. A prediction of new values confirms the problem as the model does not produce regular probability estimates but values which are way higher than 1 and lower than 0 in many cases. 
I have tried both methods setting the family=binomial and family=binomial(“logit”) so this can’t be the reason that causes the error.

As an alternative solution I have considered to resort to the Logistic tool from the RWeka package. The manual says that it exists for building multinomial logistic regression models. I can’t image it would be a problem but can anyone confirm that it indeed is possible to use the algorithm for also computing binary models?!

Best regards

Patrick
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