Try:
all.vars(formula(my.model))
On Feb 19, 2008 1:10 PM, Sung, Iyue <[EMAIL PROTECTED]> wrote:
> Fellow R users,
>
> I have an lm object, from which I would like to extract the list of
> original variables.
> The problem I have is the formula includes functions of the covariates.
>
> I tried using "attr", but the result stores the transformed variable
> name. For example:
>
> > my.model<-lm(y ~ a + log(b + 1), data=my.data)
> > as.character(attr(my.model$terms, "variables"))[-1]
> [1] "y" "a" "log(b + 1)"
>
> But I just want a character vector of the original variables ("y", "a",
> "b"), not ("y", "a", "log(b + 1)").
> Does someone have a solution they could kindly share?
>
> Thanks,
> Iyue
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