It could be done like this:
> a <- if (TRUE) . ~ . + freeny.x[,4] else . ~ .
> fo <- update(freey.y ~ freeny.x[, -4], a)
> fo
freey.y ~ freeny.x[, -4] + freeny.x[, 4]
On Mon, Mar 3, 2008 at 6:24 PM, Rolf Turner <[EMAIL PROTECTED]> wrote:
>
> Matthieu wants to manipulate the *formula* --- i.e. co
Matthieu wants to manipulate the *formula* --- i.e. control
what predictors go into the formula --- rather than to add something
to one of the predictors (or not, as the case maybe).
I.e. what is wanted is that if ``condition'' is TRUE then the
formula should be
freeny.y ~ freeny.x[,-4]
>From: Matthieu Stigler <[EMAIL PROTECTED]>
>Date: 2008/03/03 Mon PM 04:07:09 CST
>To: r-help@r-project.org
>Subject: [R] How to include an externally defined NULL value in lm
maybe you should a<-0 unless there's special
behavior of NULL that's unknownst to me ?
>Hello!
>
>I would love to be abl
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