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Re: st: Confusion specifications GLM


From   "Peter F. Schmidt" <schmidt.peterf@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Confusion specifications GLM
Date   Mon, 24 Mar 2008 13:17:54 +0100

hello marten,

thanks for the hint. that seems to the right model. i tried to use the
ztnb but stata gives the error message that convergence could not be
achieved. on the ucla stata page is a warning that the method might be
problematic with a small sample, but it is unclear what is a small
sample. i have 180 observations. do you have any idea how to get the
regression running?

in some instances, i create a percentage variable of negative coverage
once coverage is received. for that i am able to poisson now.

however, the problem with the at 1 trunctated count variable and
stata's error message that convergence could not be achieved persists.


thank you for your help

peter

2008/3/24, Maarten buis <maartenbuis@yahoo.co.uk>:
> --- "Peter F. Schmidt" <schmidt.peterf@googlemail.com> wrote:
>  > my variable is overdispersed, ruling out poisson, and as it is
>  > conditioned on that at least one article is written, i do not have
>  > zero values.
>
>
> Have a look at -help ztp- and -help ztnb-.
>
>  Hope this helps,
>  Maarten
>
>  -----------------------------------------
>  Maarten L. Buis
>  Department of Social Research Methodology
>  Vrije Universiteit Amsterdam
>  Boelelaan 1081
>  1081 HV Amsterdam
>  The Netherlands
>
>  visiting address:
>  Buitenveldertselaan 3 (Metropolitan), room Z434
>
>  +31 20 5986715
>
>  http://home.fsw.vu.nl/m.buis/
>  -----------------------------------------
>
>
>
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