Are you sure the class type of your object is right? Try: class(glm(...)) # obviously fill in the dots..."glm" should be among the results Alternatively, you could have somehow not loaded or written over your predict.glm function. Try: getS3method("predict","glm") # should return the predict.glm function Ari Seems odd though that no one should have written it. On Sun, Mar 30, 2008 at 3:38 PM, Goodarz Danaei <gdanaei at hsph.harvard.edu> wrote: _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l