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

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

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 �crit:
> 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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