Some Remarks on Testing Overdispersion in Zero-Inflated Poisson and Binomial Regression Models |
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| Authors: | Zhao Yang James W Hardin Cheryl L Addy |
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| Institution: | 1. Quintiles, Inc. , Overland Park, Kansas, USA tonyyangsxz@gmail.com;3. Department of Epidemiology and Biostatistics, Arnold School of Public Health , University of South Carolina , Columbia, South Carolina, USA |
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| Abstract: | This note extends the score test statistics for overdispersion in Poisson and binomial regression models (Dean, 1992
Dean , C. B. ( 1992 ). Testing for overdispersion in Poisson and binomial regression models . J. Amer. Statist. Assoc. 87 : 451 – 457 .Taylor & Francis Online], Web of Science ®] , Google Scholar]) to the zero-inflated models. Some general results are obtained, and examples illustrate the application of the extended results. |
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| Keywords: | Binomial regression model Exponential family Overdispersion Poisson model Score test Zero-inflation |
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