Please summarize the responses you receive to this question for the rest of
us.
Thanks,
Ted Wright
On Fri, 22 Jan 1999, Isabelle Robichaud wrote:
>
> Dear fellow S-Plus users,
>
> I am relatively new at S-Plus, which might explain my question, but
> I have come across a behavior that puzzles me. Any
> insight/comments would be very appreciated.
>
> I obtain different results whether I put parentheses or not around
> the terms in interactions. For example, glm(RESP ~ X1:X2) gives
> different results from glm(RESP ~ (X1):(X2)). In fact, the second
> model gives the same deviance and df as glm(RESP ~ X1*X2)
> does. Is this normal? (X1 is a continuous variable, X2 is an
> ordered factor.)
>
> Sorry if the question is evident to everyone but me. Thanks in
> advance!
>
> Isabelle
> p.s. I work with version 4.5 (professional, release 2) on a Pentium
> 233, 32 M of RAM.
>
> Isabelle Robichaud
> Departement de biologie
> Universite de Moncton
> Moncton NB Canada E1A 3E9
> e-mail: eir8049@umoncton.ca
>
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