[R] Stepwise Multiple Regression

[frank frank]

Dear R,
I am using stepwise multiple glm to select a subset of variables using the step command. My question is how do you calculate the percentage variance for each parameter in the reduced model. An example of my code thus far is,

fit<-glm(Abalone~offset(Area)+Sessile invertebrates+Bare rock+ NCA + Encrusting red algae, family = poisson ())

step(fit)

fit1<-glm(Abalone~offset(Area)+Bare rock+NCA+Encrusting red algae, family=poisson())

Thanks in advance
Beth Strain


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