[R] glm with four variables

[Martyn Plummer]

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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