zelig should return the model.frame

[izahn]

zelig does not return the model frame, which causes plot to fail:

m0 <- lm(mpg ~ hp*am, data=mtcars)
m1 <- zelig(mpg ~ hp*am, model="ls", data=mtcars, cite=FALSE)

plot(m0) #diagnostic plots
plot(m1) #does not work: Error in eval(predvars, data, env) : invalid 'envir' argument

m1$result$model <- m0$model
plot(m1)# works

So plot appears to fail because the model component of the lm results list is not available. This should be added so that plot and other methods that depend on the model component of the list will work correctly.

This is with Zelig version 4.1-2

[whatever]

Thanks, and nice catch. I just altered how external methods are called, and this seems related (Issue #34).

I'll likely add a hook for the core GLM models.

[theresea]

I just ran into the same problem. My code including the plot(z.out1) command returns the error "Error in eval(predvars, data, env) : invalid 'envir' argument of type 'closure'". The fix above does not work for me because I am letting Zelig estimate robust standard errors.

Is there any general fix yet? How can I alternatively produce the diagnostic plots from the z.out1-object?

Any quick responses are highly appreciated as I only ran into this now and need to turn in my thesis by tomorrow. Thank you!

mydata2$dlhs3_anc_gov<-ifelse(mydata2$dlhs3_anc_gov<=1,mydata2$dlhs3_anc_gov,NA)
fm3<-logit(dlhs3_anc_gov)~death0406_av+lnpcgdp0405+ln_totalpop+URBANISATION+totalliteracyrate+CST_percent+dlhs2_anc_gov
z.out3<-zelig(fm3,model="ls",data=mydata2,robust=TRUE)
summary(z.out1) #runs without a problem
plot(z.out1) #returns Error in eval(predvars, data, env) : invalid 'envir' argument of type 'closure