Dear R-users:
How does one calculate in R the odds ratios for a CATEGORICAL predictor
variable that has 4 levels. I see r-help inquiries regarding odds ratios
for what looked like a continuous predictor variable. I was wondering how
to get the pairwise odds ratios for comparisons of levels of a categorical
predictor variable. I can't seem to get the correct output using:
> sp.glm=glm(cohort$logreg~cohort$hab, family=binomial)
> summary(sp.glm)
This gives me the coefficient for the effect of hab overall, but not the
coefficients for the comparisons of each of the levels. I suspect this has
something to do with the contrasts statement, but I can't figure it out,
and would be very appreciative of any help you can provide.
Thank you,
Sabrina
______________________________________________________________
Sabrina E. Russo
Postdoctoral Fellow
Center for Tropical Forest Science - Arnold Arboretum Asia Program
Harvard University
22 Divinity Avenue
Cambridge, MA 02138 USA
617-496-2380 phone
617-495-9484 FAX
[EMAIL PROTECTED]
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