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Title: DGLMExtPois: Advances in Dealing with Over and Under-dispersion in a Double GLM Framework
Authors: Sáez-Castillo, Antonio J.
Conde-Sánchez, Antonio
Martínez, Francisco
Abstract: In recent years the use of regression models for under-dispersed count data, such as COM-Poisson or hyper-Poisson models, has increased. In this paper the DGLMExtPois package is presented. DGLMExtPois includes a new procedure to estimate the coefficients of a hyper-Poisson regression model within a GLM framework. The estimation process uses a gradient-based algorithm to solve a nonlinear constrained optimization problem. The package also provides an implementation of the COM-Poisson model, proposed by Huang (2017), to make it easy to compare both models. The functionality of the package is illustrated by fitting a model to a real dataset. Furthermore, an experimental comparison is made with other related packages, although none of these packages allow you to fit a hyper-Poisson model.
Keywords: hyper-Poisson regression
COM-Poisson regression
Count data
Issue Date: Dec-2022
metadata.dc.description.sponsorship: This work was supported by MCIN/AEI/10.13039/501100011033 [project PID2019-107793GB-I00].
Publisher: The R Foundation
Appears in Collections:DEIO-Artículos

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