[R-sig-eco] Calc'ing McFadden’s R2 in R

[Pekin, Burak K]

I have been wondering about the same thing recently. Is calculating an R2 useful for glms with poisson distribution useful? The standard glm summary outputs p-values and an AIC for the overall model, but there isnt anything that tells you how well the model explains the variation in the data. I assume there is a reason for this?
-Burak


________________________________________
From: r-sig-ecology-bounces at r-project.org [r-sig-ecology-bounces at r-project.org] On Behalf Of kgorman [kgorman at sfu.ca]
Sent: Friday, April 01, 2011 3:38 PM
To: r-sig-ecology at r-project.org
Subject: [R-sig-eco] Calc'ing McFadden’s R2 in R

Hello,
I am wondering about calculating R2 values for logistic regression/glm models in R. I assume this is possible, but have not run across R code to do it.

Thanks for any guidance!

Kristen

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