Terry Elrod posted functions for (pseudo-)R^2 on S-news back in 1998:
http://www.biostat.wustl.edu/archives/html/s-news/1998-02/msg00267.html
I am not sure that it performs well as a check of the model, so you might want to investigate that further.
[EMAIL PROTECTED] wrote:
I'm using glm function to do logistic regression and now I want to know if it exists a kind of R-squared with this function in order to check the model.
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