[R] Q: Odds Ratio

[kjetil@entelnet.bo]

On 17 Mar 2004 at 11:50, Cristian Pattaro wrote:

> Dear all,
> 
> is there a automatic method to obtain Odds Ratio estimates and their
> confidence intervals from a GLM Logistic model?
> 

The parameters in the linear predictor in logistic regression 
are log odds ratios (assuming the default contrast, contr.treatment). 
So just exponentiate it!, and do the same with the confidence limits.

Maybe the best way to obtain confidence limits are 
library(MASS)
mod <- glm(...)
confint(mod)
which uses likelihood profiling

Kjetil Halvorsen

> Thanks
> Cristian
> 
> =============================================
> Cristian Pattaro
> =============================================
> Unit of Epidemiology & Medical Statistics
> Department of Medicines and Public Health
> University of Verona
> cristian at biometria.univr.it
> =============================================
> 
> 
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