Re: st: RE: Fwd: zip zinb : testparm or loglikelihood ?

[Johanna LEPEULE <lepeule@vet-nantes.fr>]

Hi Marteen,

Thanks Marteen for your answer.

I forgot to specify that I also use a random effect.

Thus :
xi : zip nbaoaj i.breed agerx6 i.mother_age, inflate(i.breed agerx6)
cluster(farm) robust

When I test the addition of the variable "i.mother_age", I do not have the
same result with "testparm" or with "Loglikelihood test". It seems that the
loglikelihood test does not take into account the random effect.

And I do not know which test I have to use ?

Johanna


Le 11:48 18/06/2007, vous avez �crit:
> --- Johanna LEPEULE wrote:
>  >I use zero-inflated (Poisson and negative-binomial) models.
> >Y=nbaoaj, is a number of lesions.
> >X=mother_age, is a qualitative variable with 3 classes
> >Can I use xi: testparm i.mother_age, equation(nbaoaj) to test the global
> >effect of the variable mother_age ?
> >Or must I use the Loglikelihood ratio test ?
>
> Why do you doubt that you can use -testparm-?
>
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
> Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
>
> visiting address:
> Buitenveldertselaan 3 (Metropolitan), room Z434
>
> +31 20 5986715
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
>
>
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Johanna Lepeule
UMR 708 Gestion de la Sant� Animale
Ecole V�t�rinaire de Nantes / INRA
BP 40706, 44307 Nantes Cedex 03
T�l�phone: +33 (0) 240 687 821, Fax: +33 (0) 240 687 768
courriel : lepeule@vet-nantes.fr


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