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Improved estimators for the zero-inflated Poisson regression model in the presence of multicollinearity: simulation and application of maternal death data
Jönköping University, Jönköping International Business School, JIBS, Economics, Finance and Statistics. Department of Statistics and Computer Science, University of Veterinary and Animal Sciences, Lahore, Pakistan.
Jönköping University, Jönköping International Business School, JIBS, Statistics.ORCID iD: 0000-0003-3144-2218
Jönköping University, Jönköping International Business School, JIBS, Statistics.ORCID iD: 0000-0002-4535-3630
Department of Mathematics and Statistics, Florida International University, Miami, FL, United States.
2021 (English)In: Communications in Statistics Case Studies Data Analysis and Applications, ISSN 2373-7484, Vol. 7, no 3, p. 394-412Article in journal (Refereed) Published
Abstract [en]

In this article, we propose Liu-type shrinkage estimators for the zero-inflated Poisson regression (ZIPR) model in the presence of multicollinearity. Our new approach is a remedy to the problem of inflated variances for the ML estimation technique—which is a standard approach to estimate these types of count data models. When the data are in the form of non-negative integers with a surplus of zeros it induces overdispersion in the dependent variable. Considerable multicollinearity is frequently observed, but usually disregarded, for these types of data sets. Based on a Monte Carlo study we illustrate that our proposed estimators exhibit better MSE and MAE than the usual ML estimator and some other Liu estimators in the presence of multicollinearity. To demonstrate the advantages and the empirical relevance of our improved estimators, maternal death data are analyzed and the results illustrate similar benefits as is demonstrated in our simulation study.

Place, publisher, year, edition, pages
Taylor & Francis, 2021. Vol. 7, no 3, p. 394-412
Keywords [en]
Count data, maternal deaths, MSE, shrinkage estimator, zero-inflated Poisson
National Category
Probability Theory and Statistics
Identifiers
URN: urn:nbn:se:hj:diva-54245DOI: 10.1080/23737484.2021.1952493Scopus ID: 2-s2.0-85112089158Local ID: HOA;intsam;757745OAI: oai:DiVA.org:hj-54245DiVA, id: diva2:1585203
Funder
The Research Council of Norway, 274569Available from: 2021-08-16 Created: 2021-08-16 Last updated: 2021-12-19Bibliographically approved

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Omer, TalhaSjölander, PärMånsson, Kristofer

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