Sufficient Reduction Method for Bivariate Zero-Inflated Poisson Process

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DOI: https://doi.org/10.28924/2291-8639-22-2024-16
Published: Jan 16, 2024
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Sawaporn Hinsheranan, Sufficient Reduction Method for Bivariate Zero-Inflated Poisson Process, Int. J. Anal. Appl., 22 (2024), 16.

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Sawaporn Hinsheranan

Abstract

The sufficient reduction (SR) method was developed for detecting a mean shift in a bivariate zero-inflated Poisson process. The derived sequence of statistics from the reduction was monitored with the EWMA and EWMA-SN charts for monitoring a mean shift in a process. The detection performance was compared against other SR methods developed for a Poisson process and evaluated via the simulations under the different shift sizes and proportions of zero in the process. The results showed that the presence of zeros in the process influenced the performance of SR methods by delaying shift detection and reducing the detection accuracy, especially when shift size was small. The proposed method with the EWMA chart gave the shortest delay for detecting a small to moderate shift and gave the highest true alarm rate and the lowest non-detection rate for detecting a small shift compared to other methods.

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