modEvA D-squared for gamma glm

Hi All,

I am running a generalized linear model with gamma distribution in R (glm,
family=gamma ) for my data (gene expression as response variable and few
predictors). I want to calculate r-squared for this model.

I have been reading online about it and found there are multiple formulas
for calculating R2 (psuedo) for glm (in R) with gaussian (r2 from linear
model), logistic regression (1-deviance/null deviance), poisson
distribution (using pR2 in pscl package, D-squared value from modEvA R
package). But I could not find anything specific to gamma distributions.

Can pscl and modEVA packages be used for gamma distributions as well? or
there is any other formula for doing the same?

Thanks

Regards,

Anchal

Anchal Sharma, PhD
Postdoctoral Fellow
195, Little Albany street,
Cancer Institute of New Jersey
Rutgers University
NJ-08901

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