A Generalization of the Exponential-Poisson Distribution

Details A Generalization of the Exponential-Poisson Distribution A Generalization of the Exponential-Poisson Distribution

2008-09-10

arxiv.org/abs/0809.1894v1

Statistics & Probability Letters, 79, 2493-2500. (2009)

Statistics

Methodology

Scientific paper

10.1016/j.spl.2009.09.003

The two-parameter distribution known as exponential-Poisson (EP) distribution, which has decreasing failure rate, was introduced by Kus (2007). In this paper we generalize the EP distribution and show that the failure rate of the new distribution can be decreasing or increasing. The failure rate can also be upside-down bathtub shaped. A comprehensive mathematical treatment of the new distribution is provided. We provide closed-form expressions for the density, cumulative distribution, survival and failure rate functions; we also obtain the density of the $i$th order statistic. We derive the $r$th raw moment of the new distribution and also the moments of order statistics. Moreover, we discuss estimation by maximum likelihood and obtain an expression for Fisher's information matrix. Furthermore, expressions for the R\'enyi and Shannon entropies are given and estimation of the stress-strength parameter is discussed. Applications using two real data sets are presented.

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