Abstract
The product partition model (PPM) is widely used for detecting multiple change points. Because changes in different parameters may occur at different times, the PPM fails to identify which parameters experienced the changes. To solve this limitation, we introduce a multipartition model to detect multiple change points occurring in several parameters. It assumes that changes experienced by each parameter generate a different random partition along the time axis, which facilitates identifying those parameters that changed and the time when they do so. We apply our model to detect multiple change points in Normal means and variances. Simulations and data illustrations show that the proposed model is competitive and enriches the analysis of change point problems.
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Acknowledgements
We would like to thank the editors and anonymous referees whose comments and suggestions have contributed to improve this paper. We also thank Stefano Peluso for making code to fit the DPM19 model freely available.
Funding
This work was partially funded by Coordenação de Aperfeiçoamento de Pessoal de Ensino Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, 405025/2021-1, 304268/2021-6, 301627/2017-7) and Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG, PPM-00243-18). Additional support for this work was obtained from grants Fondecyt 1180034, 1220017 and ANID - Millennium Science Initiative Program - NCN17_059.
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Pedroso, R.C., Loschi, R.H. & Quintana, F.A. Multipartition model for multiple change point identification. TEST 32, 759–783 (2023). https://doi.org/10.1007/s11749-023-00851-4
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DOI: https://doi.org/10.1007/s11749-023-00851-4