-roger
Sabrina Russo wrote:
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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