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Poisson QMLE for change-point detection in general integer-valued time series models

Author

Listed:
  • Mamadou Lamine Diop

    (CY Cergy Paris Université)

  • William Kengne

    (CY Cergy Paris Université)

Abstract

We consider together the retrospective and the sequential change-point detection in a general class of integer-valued time series. The conditional mean of the process depends on a parameter $$\theta ^*$$ θ ∗ which may change over time. We propose procedures which are based on the Poisson quasi-maximum likelihood estimator of the parameter, and where the updated estimator is computed without the historical observations in the sequential framework. For both the retrospective and the sequential detection, the test statistics converge to some distributions obtained from the standard Brownian motion under the null hypothesis of no change and diverge to infinity under the alternative; that is, these procedures are consistent. Some results of simulations as well as real data application are provided.

Suggested Citation

  • Mamadou Lamine Diop & William Kengne, 2022. "Poisson QMLE for change-point detection in general integer-valued time series models," Metrika: International Journal for Theoretical and Applied Statistics, Springer, vol. 85(3), pages 373-403, April.
    • Handle: RePEc:spr:metrik:v:85:y:2022:i:3:d:10.1007_s00184-021-00834-1
    DOI: 10.1007/s00184-021-00834-1
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    References listed on IDEAS

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