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Re: st: RE: continuous variable+zip,zinb


From   Johanna LEPEULE <lepeule@vet-nantes.fr>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: continuous variable+zip,zinb
Date   Mon, 06 Nov 2006 16:49:46 +0100

Thank you Maarten,

Is there assumptions between continuous x and incidence rates for the
Poisson part ?

Thanks
Johanna Lepeule


Le 16:22 06/11/2006, vous avez écrit:
Johanna Lepeule:
You can use continuous variables in both parts. However, the linearity
assumption in the inflate part is in terms of log odds and not in terms
of y. So looking at a scatter of y versus continuous x won't tell you
anything about the feasibility of this assumption.
HTH,
Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Johanna LEPEULE
Sent: maandag 6 november 2006 16:08
To: statalist@hsphsun2.harvard.edu
Subject: st: continuous variable+zip,zinb

Dear Stata listers,

I use zip and zinb models.
I think I can use continuous variables in the inflate part (binary part) of
the model if I check the linearity assumption between the continuous x
variable and the Y variable. Is it right ?
However, I am not sure if I can use continuous variables in the Poisson or
Negative binomial part.

Does anyone have suggestions ?
Thanks
Johanna Lepeule


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