Hello!
I would love to be able to include an external variable to a lm call, I
mean something:
if(TRUE)
a-freeny.x[,4]
else
a-NULL
lm(freeny.y~freeny.x[,-4] +a)
but it does not work with a-NULL, whereas
lm(freeny.y~freeny.x[,-4] +NULL)
I don't understand why and did not find an
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 able to
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]
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. control
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