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A new four-parameter discrete distribution with bathtub and unimodal failure rate

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  • Vahid Nekoukhou
  • Hamid Bidram

Abstract

In this paper, a discrete counterpart of the general class of continuous beta-G distributions is introduced. A discrete analog of the beta generalized exponential distribution of Barreto-Souza et al. [2], as an important special case of the proposed class, is studied. This new distribution contains some previously known discrete distributions as well as two new models. The hazard rate function of the new model can be increasing, decreasing, bathtub-shaped and upside-down bathtub. Some distributional and moment properties of the new distribution as well as its order statistics are discussed. Estimation of the parameters is illustrated using the maximum likelihood method and, finally, the model with a real data set is examined.

Suggested Citation

  • Vahid Nekoukhou & Hamid Bidram, 2015. "A new four-parameter discrete distribution with bathtub and unimodal failure rate," Journal of Applied Statistics, Taylor & Francis Journals, vol. 42(12), pages 2654-2670, December.
    • Handle: RePEc:taf:japsta:v:42:y:2015:i:12:p:2654-2670
    DOI: 10.1080/02664763.2015.1046822
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