[R] Disentagling formulas
E.Vettorazzi at uke.uni-hamburg.de
Tue Oct 2 10:51:45 CEST 2007
and this runs without an error. So I still didn't get the point.
You may also need to insulate your new response variable if you want to
estimate a model with in fact only one response variable, which ist done
by I() as in
Rebecca Sela schrieb:
> Update looks like the function I want to use, but it still isn't working, possibly because I am doing something more complicated than my message implied.
> What I want to do is subtract a vector of random effects (determined within the function) from Y. I hoped that something like this:
> tree <- rpart(update(formula,.-NewRandomEffects~.))
> would work, but I got the message
> Error in update.default(formula, . - NewRandomEffects ~ .) :
> need an object with call component
> I have considered creating a function that would subtract the random effect from each Y individually, but there is no identifier on Y.
> Is there an obvious fix I'm missing?
> Thanks for your suggestions!
> ----- Original Message -----
> From: "Eik Vettorazzi" <E.Vettorazzi at uke.uni-hamburg.de>
> To: "Rebecca Sela" <rsela at stern.nyu.edu>
> Cc: r-help at r-project.org
> Sent: Monday, October 1, 2007 11:34:13 AM (GMT-0500) America/New_York
> Subject: Re: [R] Disentagling formulas
> maybe I didn't understand the problem, but you can do sth like
> will help you too.
> Rebecca Sela schrieb:
>> 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)
>> 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 Sela
>> Statistics Department
>> Stern School of Business
>> New York University
>> R-help at r-project.org mailing list
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
Institut für Medizinische Biometrie und Epidemiologie
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