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# Re: st: Regression Equation for Zero inflated negative binomial

 From Amir Sariaslan <[email protected]> To [email protected] Subject Re: st: Regression Equation for Zero inflated negative binomial Date Mon, 19 Sep 2011 15:37:41 +0200

```Rachel,

The formulas are covered in the following book:
http://www.stata.com/bookstore/negative-binomial-regression/

Sincerely,
Amir

2011/9/19 rachel grant <[email protected]>:
> Thank you for your help. Maybe I need to explain the problem more clearly
> I have used Zero Inflated negative binomial regression in Stata to
> model some overdispersed, zero inflated count data. I got very nice
> results and also used the postestimation tools to predict Y values.
> This is included in my PhD thesis which I am about to submit. My PhD
> supervisor said as well as presenting the results (i.e cofficients, p
> values etc.) I also have to show "the model". I think by this he means
> the regression equation in the form:
>
> natural log (Y) = B0+B1X1 + B2X2..............
>
> I cannot find out what the equation is for ZINB models and also I
> cannot find out how to make Stata display this model.
> I could just add in the coefficients myself BUT I am not sure of the
> exact formula of the model for ZINB (especially the ZI part) as I
> think it may be more complicated than the simple Poisson
>
> log e  (Y) = β0 + β1Χ1 + β2Χ2 ...
>
> I have searched everywhere to find a general equation for ZINB with no
> luck and also read all the Stata help files.
> I am very confused about why this seemingly simple thing should prove
> so impossible! I am a beginner with stata, and previously only used
> simple linear regression so thank you for your patience.
>
> --
> regards, Rachel Grant
>
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