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chose
2006 Feb 27
1
help with step()
Folks:
I'm having trouble doing a forward variable selection using step()
First, I fit an initial model:
fit0 <- glm ( est~1 , data=all, subset=c(n>=25) )
then I invoke step():
fit1 <- step( fit0 , scope=list(upper=est~ pcped + pchosp + pfarm
,lower=est~1))
I get the error message: Error in eval(expr, envir, enclos) : invalid
'envir' argument
I looked at the documention on step(). There is no 'envir' arguement.
Can anyone shed light on what I'm doing wrong?
Thanks,
Phil Smith
CDC
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