Rebecca,
you can keep formula as a character vector that can be easily manipulated
formula1 <- "Y~X1+X2+X3"
formula2 <- gsub("Y","newY",formula1)
lm(as.formula(formula1),data=mydata)
lm(as.formula(formula2),data=mydata)
best,
peter
On 10/1/07, Rebecca Sela <[EMAIL PROTECTED]> 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
>
> ______________________________________________
> R-help@r-project.org mailing list
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
--
Peter Salzman, PhD
Department of Biostatistics and Computational Biology
University of Rochester
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