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From |
rachel grant <rachelannegrant@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: Regression Equation for Zero inflated negative binomial |

Date |
Mon, 19 Sep 2011 09:54:29 +0100 |

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 * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Regression Equation for Zero inflated negative binomial***From:*rachel grant <rachelannegrant@gmail.com>

**Re: st: Regression Equation for Zero inflated negative binomial***From:*Amir Sariaslan <amir.sariaslan@gmail.com>

**Re: st: Regression Equation for Zero inflated negative binomial***From:*Maarten Buis <maartenlbuis@gmail.com>

**Re: st: Regression Equation for Zero inflated negative binomial***From:*Muhammad Anees <anees@aneconomist.com>

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