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Re: st: Mixed effects model with zero-inflated negative binomial outcome for repeated measures data


From   "JVerkuilen (Gmail)" <jvverkuilen@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Mixed effects model with zero-inflated negative binomial outcome for repeated measures data
Date   Sat, 12 Jan 2013 19:05:36 -0500

On Sat, Jan 12, 2013 at 1:43 PM, W Robert Long <W.R.Long@leeds.ac.uk> wrote:

>
> Is it possible to fit this kind of model in Stata ? If so, could you provide
> some pointers ?

I believe you could specify such a model in -gllamm- and seem to
recall that one of the examples on the web page compare Poisson, NB,
ZIP and ZINB, but if you look at http://www.gllamm.org/examples.html
the examples are there for you.

That said, I suspect that a ZINB with mixed effects would be a pretty
tough model to estimate well in nearly any package given that the NB
overdispersion parameter, overdispersion created by zero inflation,
and overdispersion created by clustering are all likely to be highly
collinear.
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