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


From   Johanna LEPEULE <[email protected]>
To   [email protected]
Subject   RE: st: RE: Fwd: zip zinb : testparm or loglikelihood ?
Date   Wed, 27 Jun 2007 15:53:41 +0200

Thank you Marteen for your help.
I looked at the document that you indicated to me and I used it to build my
model.

Johanna Lepeule

Le 14:35 18/06/2007, vous avez �crit:
--- Johanna LEPEULE wrote:
> 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.

This is crucial information. You can find the answer at:
http://www.stata.com/support/faqs/stat/lrtest.html

Hope this helps,
Maarten

-----------------------------------------
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 : [email protected]


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