The Generalized Discrete Half-Normal Distribution: an alternative distribution for analysing count data

Josmar Mazucheli, Ricardo Puziol de Oliveira, Jean Carlos Cardoso

Abstract


In general, data that are obtained by counting processes, strictly discrete or discretized (from truncations and/or rounding), are analyzed, without exhaustion, by the Geometric, Logarithmic, Poisson and Negative Binomial distributions. In recent years a large number of discrete distributions have been proposed in the literature from the discretization of continuous random variables. Many of the discretization methods preserve one or more characteristics of the continuous version, with the proposal of Nakagawa e Osaki (1975) being the most used. In this paper, from this methodology, which makes use of the survival function, we propose the discrete version of the continuous generalized Half-Normal distribution, introduced in the literature by Cooray e Ananda (2008). Some of its properties are discussed and Monte Carlo simulations evaluate the bias and accuracy of the estimates obtained by the maximum likelihood method and method of moments. Some discrete data sets found in the literature are considered to illustrate the applicability of the proposed distribution.

Keywords


Discretization; Generalized Half-Normal Distribution; Method of moments; Monte Carlo simulation; Likelihood

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DOI: http://dx.doi.org/10.5902/2179460X36214

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