Message-ID: <x21xw1w3s1.fsf@biostat.ku.dk>
Date: 2003-08-04T22:39:23Z
From: Peter Dalgaard
Subject: unexpected behaviour in lm() (PR#3657)
In-Reply-To: <200308042011.h74KBrJH006556@pubhealth.ku.dk>
ottk@bms.com writes:
> > lm(c(1:10) ~ c(1:10))
>
> Call:
> lm(formula = c(1:10) ~ c(1:10))
>
> Coefficients:
> (Intercept)
> 5.5
Unexpected: yes, bug: no.
Thing is that the lm logic removes the resonse from the set of
predictors. This is to support stuff like "y ~ .", I believe.
You get the same effect from
> x <- c(1:10)
> lm(x~x)
Call:
lm(formula = x ~ x)
Coefficients:
(Intercept)
5.5
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) FAX: (+45) 35327907