[R] Extracting original variable list from lm object

[Gabor Grothendieck]

Try:

all.vars(formula(my.model))


On Feb 19, 2008 1:10 PM, Sung, Iyue <Iyue.Sung at lippincott.com> 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
> ----------------------------------------------------------------------------
> This e-mail and any attachments may be confidential or l...{{dropped:11}}
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>