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On Poisson-exponential-Tweedie models for ultra-overdispersed count data

Author

Listed:
  • Rahma Abid

    (University of Sfax
    Paris-Dauphine University of Tunis)

  • Célestin C. Kokonendji

    (Université Bourgogne Franche-Comté)

  • Afif Masmoudi

    (University of Sfax)

Abstract

We introduce a new class of Poisson-exponential-Tweedie (PET) mixture in the framework of generalized linear models for ultra-overdispersed count data. The mean–variance relationship is of the form $$m+m^{2}+\phi m^{p}$$ m + m 2 + ϕ m p , where $$\phi$$ ϕ and p are the dispersion and Tweedie power parameters, respectively. The proposed model is equivalent to the exponential-Poisson–Tweedie models arising from geometric sums of Poisson–Tweedie random variables. In this respect, the PET models encompass the geometric versions of Hermite, Neyman Type A, Pólya–Aeppli, negative binomial and Poisson–inverse Gaussian models. The algorithms we shall propose allow to estimate the real power parameter, which works as an automatic distribution selection. Instead of the classical Poisson, zero-shifted geometric is presented as the reference count distribution. Practical properties are incorporated into the PET of new relative indexes of dispersion and zero-inflation phenomena. Simulation studies demonstrate that the proposed model highlights unbiased and consistent estimators for large samples. Illustrative practical applications are analysed on count data sets, in particular, PET models for data without covariates and PET regression models. The PET models are compared to Poisson–Tweedie models showing that parameters of both models are adopted to data.

Suggested Citation

  • Rahma Abid & Célestin C. Kokonendji & Afif Masmoudi, 2021. "On Poisson-exponential-Tweedie models for ultra-overdispersed count data," AStA Advances in Statistical Analysis, Springer;German Statistical Society, vol. 105(1), pages 1-23, March.
  • Handle: RePEc:spr:alstar:v:105:y:2021:i:1:d:10.1007_s10182-020-00375-4
    DOI: 10.1007/s10182-020-00375-4
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    1. Shaul K. Bar-Lev & Ad Ridder, 2022. "The Large Arcsine Exponential Dispersion Model—Properties and Applications to Count Data and Insurance Risk," Mathematics, MDPI, vol. 10(19), pages 1-25, October.

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