[R] help with predict in stats4

[David Kaplan]

Hi,

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

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

# 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.
Professor
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
homepage:
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Phone: 608-262-0836