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st: RE: continuous variable+zip,zinb

From   "Maarten Buis" <[email protected]>
To   <[email protected]>
Subject   st: RE: continuous variable+zip,zinb
Date   Mon, 6 Nov 2006 16:22:15 +0100

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.

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

-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of Johanna LEPEULE
Sent: maandag 6 november 2006 16:08
To: [email protected]
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 ?
Johanna Lepeule

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