If you are estimating your models on the full sample, then your first
equation compares pre-term against normal AND infection, while the
second one compares infection against normal AND pre-term. You should
put everything together with the dummies and interactions to make it a
complete model.
I don't see why you need -gllamm- for this model though.
On 12/23/05, [email protected] <[email protected]> wrote:
> Thanks Austin. Including those terms does make the coefficients the same but turns them not significant. The quadratic term for time is significant in the models.
> What would be the mathematical explanation as to why the coefficients become the same when all interaction terms are added?
>
> Thanks,
>
> Leny
>
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--
Stas Kolenikov
http://stas.kolenikov.name
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