Estimation and testing of binomial and beta-binomial regression models with and without zero inflation

We present new Stata commands for carrying out several regression commands suitable for binomial outcomes. The zib command extends Stata’s binreg command to allow zero inflation. The betabin command fits binomial regression models allowing for beta overdispersion, and the zibbin command fits a beta-binomial regression model with zero inflation. All the new commands allow the specification of links within the glm command’s collection for both outcome and zero inflation. The zero-inflated commands optionally calculate a Vuong test comparing the zero-inflated model with the nonzero-inflated model, and the zibbin command optionally includes a likelihood-ratio test of the overdispersion parameter.


Issue Date:
2014-2014-2014
Publication Type:
Journal Article
ISSN:
1536-8634
Language:
English
Published in:
Stata Journal, Volume 14, Number 2
Page range:
292-303

Record appears in:



 Record created 2017-07-17, last modified 2017-08-29

Fulltext:
Download fulltext
PDF

Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)