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st: RE: continuous variable+zip,zinb
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: [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 ?
Thanks
Johanna Lepeule
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