--- 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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