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ESTIMAÇÃO DOS PARÂMETROS DA DISTRIBUIÇÃO BETA-BINOMIAL: UMA APLICAÇÃO USANDO O SOFTWARE SAS

2015; UNIVERSIDADE FEDERAL DE SANTA MARIA; Volume: 37; Issue: 3 Linguagem: Inglês

10.5902/2179460x17512

2179-460X

Edson Zangiacomí Martínez, Jorge Alberto Achcar, Davi Casale Aragon,

Food Security and Health in Diverse Populations

In this paper we describe the parameter estimation of the beta-binomial distribution using the procedure NLMIXED of the SAS software. The beta-binomial distribution is a discrete mixture distribution which can capture overdispersion in the data. The estimation of parameters of the beta-binomial distribution can lead to computational problems, since it does not belong to the exponential family and there are not explicit solutions for the maximum likelihood estimation. Using a real dataset, we show that the SAS software can be satisfactorily used for the estimation of the parameters. We also consider the possibility of including a covariate in the model. The SAS codes used in this paper are given in an Appendix.