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

• Autores: James W. Hardin, Joseph M. Hilbe
• Localización: The Stata journal, ISSN 1536-867X, Vol. 14, Nº. 2, 2014, págs. 292-303
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • 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.