RE: st: RE: zinb for Zero-inflated negative binomial regression

[Caroline Wilson <wilson_cj@hotmail.com>]

Many thanks, Dave! I will try that.

----------------------------------------
> From: jacobs.184@sociology.osu.edu
> To: statalist@hsphsun2.harvard.edu
> Subject: st: RE: zinb for Zero-inflated negative binomial regression
> Date: Thu, 3 Oct 2013 21:56:41 +0000
>
> One possibility that's worth trying concerns your offset term. If it is something like population--which tends to be a large number in comparison to the numeric size of your other explanatory variables--you might solve your problem by dividing by a constant like 100,000 or some such to bring the numeric size of your offset variable closer to the same general size as that of your other variables.
>
> More generally, the count estimators and particularly the zero-inflated versions often have difficulty converging, but the above trick has worked for me.
>
> Hope this simple remedy helps.
>
> Dave Jacobs
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Caroline Wilson
> Sent: Thursday, October 03, 2013 3:05 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: zinb for Zero-inflated negative binomial regression
>
> Hi everyone,
>
> I'm new to using the zinb command in Stata (for a Zero-inflated negative binomial regression) and had a few questions about my code:
>
> This is my current code:
>
> zinb test var_m var_l var_c, inflate(var_m var_l var_c, offset(var_l)) vce(cluster group1)
>
>
> 1. I'm trying to add an offset variable to the model (var_l).  I have added it by including ", offset(var_l)" in the code. However, when I run the model including the offset terms it just runs indefinitely (while it runs fine when I don't include this). Is there something wrong with how I have specified this?
>
> 2. I'd like to look at residuals for some of the linear terms in the model. How might I do this with zinb?
>
> 3. I'd like to account for clustering of people within group1. Is adding "vce(cluster group1)" the correct way to handle this?
>
> Many thanks!
> Caroline
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