st: zip zinb : testparm or loglikelihood ?

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

Dear Stat-listers,

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 ?

Thank you in advance
Johanna
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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