# [R] Howto calculate R^2 from an anconva glm

Ronaldo Reis Jr. chrysopa at insecta.ufv.br
Thu Apr 17 16:19:32 CEST 2003

```Hi,

If I have the follow example:

y = count data
x1 = continuous data
x2 = qualitative data (2 factors levels)

I make a model

glm(y~x1,family=poisson)

The model has only one curve, to calculate r-square, I do

"x1 Deviance"/"total Deviance"

But in a model with x2

glm(y~x1+x2,family=poisson)

I have two curves, but I dont have, using summary() or anova(), the deviance
for separates levels. How to obtain rsquare for the two ajusted curves???

Thanks
Ronaldo

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```