[R] help with predict in stats4

David Kaplan dkaplan at education.wisc.edu
Thu Dec 11 18:12:56 CET 2008


We're using stats4 for a logistic regression.  The code is

chdreg.logit2 <- glm(chd ~ age + sex, family = binomial)
oddsratios <- coef(chdreg.logit2)

# Calculate model predicted values
pred <- predict(chdreg.logit2,type="response")

The glm part runs fine, and up to now so has the predict function.  
However, now we're getting the following error

Error in function (classes, fdef, mtable)  :
  unable to find an inherited method for function "predict", for 
signature "glm"

Any thoughts about why this seems to now be appearing. 

Thanks in advance.

David Kaplan, Ph.D.
Department of Educational Psychology
University of Wisconsin - Madison
Educational Sciences, Room, 1061
1025 W. Johnson Street
Madison, WI 53706

email: dkaplan at education.wisc.edu
Phone: 608-262-0836

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