RE: st: compare zip and nbreg model

["Jun Xu" <mystata@hotmail.com>]

Not sure if you might want to try bic or aic? For detail, see Scott and 
Freese's Stata book on this.

xj.


> From: wying1@umbc.edu
> Reply-To: statalist@hsphsun2.harvard.edu
> To: statalist@hsphsun2.harvard.edu
> Subject: st: compare zip and nbreg model Date: Fri, 18 Mar 2005 15:32:47 
> -0500 (EST)
>
> Hi, list users,
>
> I want to compare the zip and nbreg models.  Although I know both of them
> could account for the over-dispersion and the "excess-zeros", I am not
> sure which mechanism, the between-subject heterogeneity or the different
> process fo zero & non-zero counts, actually result into the
> over-dispersion and excess-zero.
>
> Unfortunately, the Stata FAQ said there is no test of nonnested modesl to
> compare the zip and nbreg.  Can anybody give me suggestions regarding
> this?
>
> Besides, how to understand and use "inflate" in the zip model?
>
>
> Thanks a lot.
>
>
> Ying
>
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