Message-ID: <XFMail.20020208141342.plummer@iarc.fr>
Date: 2002-02-08T13:13:42Z
From: Martyn Plummer
Subject: glm with four variables
In-Reply-To: <02c801c1b093$7c526420$0362c69b@th.ic.ac.uk>
On 08-Feb-2002 iago mosqueira wrote:
> Hi,
>
> Sorry if this is a very basic question, but when I run this
>
> glm(formula = loge ~ lat + ne + dep, family = gaussian)
>
> summary shows the same formula but results only for the first two variables.
> What am I doing wrong?
Probably dep is aliased: i.e. some linear combination of lat, ne and the
intercept equals dep for all values. A model with all four terms is, in
this case, unidentifiable so dep is dropped. This appears to take place
silently. It might be more useful to issue a warning.
Martyn
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