[R] Disentagling formulas

Gabor Grothendieck ggrothendieck at gmail.com
Mon Oct 1 15:40:59 CEST 2007

Try this:

fo <- y ~ x
fo[[2]] <- as.name("z")

On 10/1/07, Rebecca Sela <rsela at stern.nyu.edu> wrote:
> I am writing a program in which I would like to take in a formula, change the response (Y) variable into something else, and then pass the formula, with the new Y variable to another function.  That is, I am starting with
>         formula <- Y~X1+X2+X3
> and I'd like to do something like
>         Y <- formula$Y
>         newY <- f(Y)
>         lm(newY~X1+X2+X3)
> So far, it seems that my only option will be a very complicated sequence of steps involving match.call().  Is there a simpler way to change the response variable in a formula?
> Thanks in advance!
> Rebecca
> --
> Rebecca Sela
> Statistics Department
> Stern School of Business
> New York University
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