The beta generalized half-normal distribution

Authors:
Rodrigo R. Pescim;Clarice G. B. Demétrio;Gauss M. Cordeiro;Edwin M. M. Ortega;Mariana R. Urbano
Affiliations:
ESALQ, Universidade de São Paulo-USP, Piracicaba, Brazil;ESALQ, Universidade de São Paulo-USP, Piracicaba, Brazil;Departamento de Estatística e Informática, Universidade Federal Rural de Pernambuco-UFRPE, Recife, Brazil;ESALQ, Universidade de São Paulo-USP, Piracicaba, Brazil;ESALQ, Universidade de São Paulo-USP, Piracicaba, Brazil
Venue:
Computational Statistics & Data Analysis
Year:
2010

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Abstract

For the first time, we propose the so-called beta generalized half-normal distribution, which contains some important distributions as special cases, such as the half-normal and generalized half-normal (Cooray and Ananda, 2008) distributions. We derive expansions for the cumulative distribution and density functions which do not depend on complicated functions. We obtain formal expressions for the moments of the new distribution. We examine the maximum likelihood estimation of the parameters and provide the expected information matrix. The usefulness of the new distribution is illustrated through a real data set by showing that it is quite flexible in analyzing positive data instead of the generalized half-normal, half-normal, Weibull and beta Weibull distributions.