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arXiv 1804.09657cs.ITmath.IT
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最快搜索变化点

Quickest Search for a Change Point

Javad Heydari, Ali Tajer

摘要:

本文考虑了一个随机变量序列根据一个共同的分布。分布可能在一组未知的时刻经历瞬态变化,称为变点。目标是从序列中顺序地收集测量值,并设计动态决策规则,以便实时的最快地识别一个变化点,同时并行地控制假警报率。此设置不同于传统的变点检测设置,在传统的变点检测设置中,最多存在一个可以是持久的或瞬时的变点。该问题被认为是在极大极小设置与约束的虚警率之前的第一个变化发生。证明了Shewhart检验在最坏情况变点和最坏情况数据实现下达到精确最优性。数值评估也提供了评估性能的决策规则的特点。

英文摘要:

This paper considers a sequence of random variables generated according to a common distribution. The distribution might undergo periods of transient changes at an unknown set of time instants, referred to as change-points. The objective is to sequentially collect measurements from the sequence and design a dynamic decision rule for the quickest identification of one change-point in real time, while, in parallel, the rate of false alarms is controlled. This setting is different from the conventional change-point detection settings in which there exists at most one change-point that can be either persistent or transient. The problem is considered under the minimax setting with a constraint on the false alarm rate before the first change occurs. It is proved that the Shewhart test achieves exact optimality under worst-case change points and also worst-case data realization. Numerical evaluations are also provided to assess the performance of the decision rule characterized.

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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