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arXiv 0907.3521stat.CO
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最快变点检测算法性能分析的数值方法

A Numerical Approach to Performance Analysis of Quickest Change-Point Detection Procedures

George V. Moustakides, Aleksey S. Polunchenko, Alexander G. Tartakovsky

摘要:

对于最流行的顺序变化检测规则,如EWMA,和Shiryaev-Roberts测试,我们开发了积分方程和一个简洁的数值方法来计算一些性能指标,包括平均检测延迟和平均误报时间。我们特别注意Shiryaev-Roberts过程,并评估其性能的各种初始化策略。关于Pollak提出的随机化初始化变量,已知是渐近最优的顺序-3,我们提供了一种手段,用于数值计算的Shiryaev-罗伯茨统计量的准平稳分布,即初始化随机变量的分布,从而使该测试适用于实践。我们的计算技术的一个重要的副产品是观察到的Shiryaev-Roberts过程的确定性初始化也可以享受相同的顺序3最优性属性的Pollak的随机测试,经过仔细选择,甚至一致优于它。

英文摘要:

For the most popular sequential change detection rules such as CUSUM, EWMA, and the Shiryaev-Roberts test, we develop integral equations and a concise numerical method to compute a number of performance metrics, including average detection delay and average time to false alarm. We pay special attention to the Shiryaev-Roberts procedure and evaluate its performance for various initialization strategies. Regarding the randomized initialization variant proposed by Pollak, known to be asymptotically optimal of order-3, we offer a means for numerically computing the quasi-stationary distribution of the Shiryaev-Roberts statistic that is the distribution of the initializing random variable, thus making this test applicable in practice. A significant side-product of our computational technique is the observation that deterministic initializations of the Shiryaev-Roberts procedure can also enjoy the same order-3 optimality property as Pollak's randomized test and, after careful selection, even uniformly outperform it.

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