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arXiv 2103.13336math.STstat.TH
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一般整数值时间序列中的流行病变点检测

Epidemic change-point detection in general integer-valued time series

Mamadou Lamine Diop, William Kengne

摘要:

本文研究了一类离散值时间序列的结构变化,其中观测值的真条件分布是未知的。该过程的条件均值取决于参数$θ^*$,该参数可能随时间变化。给出了模型Poisson拟极大似然估计的相合性和渐近正态性的充分条件。我们考虑了一个流行病的变点检测,并提出了一个检验统计量的基础上的QMLE参数。在参数不变(无变化)的原假设下,检验统计量收敛于由两个布朗桥差得到的分布。在流行病替代方案下,检验统计量发散到无穷大,这表明所提出的程序在功效上是一致的。仿真和实际数据的例子说明了所提出的方法的有效性。

英文摘要:

In this paper, we consider the structural change in a class of discrete valued time series, which the true conditional distribution of the observations is assumed to be unknown. The conditional mean of the process depends on a parameter $θ^*$ which may change over time. We provide sufficient conditions for the consistency and the asymptotic normality of the Poisson quasi-maximum likelihood estimator (QMLE) of the model. We consider an epidemic change-point detection and propose a test statistic based on the QMLE of the parameter. Under the null hypothesis of a constant parameter (no change), the test statistic converges to a distribution obtained from a difference of two Brownian bridge. The test statistic diverges to infinity under the epidemic alternative, which establishes that the proposed procedure is consistent in power. The effectiveness of the proposed procedure is illustrated by simulated and real data examples.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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