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arXiv 2001.11930stat.MEstat.ML
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时间序列中事件影响的双样本检验

Two-Sample Testing for Event Impacts in Time Series

Erik Scharwächter, Emmanuel Müller

摘要:

在许多应用领域中,监测时间序列以检测极端事件,如技术故障、自然灾害或疾病爆发。不幸的是,选择提供事件信息的时间序列和强大的检测算法两者通常是不平凡的:检测可能会失败,因为检测算法不合适,或者因为在时间序列和感兴趣的事件之间没有共享信息。因此,在这项工作中,我们提出了一个非参数的统计测试之间的共享信息的时间序列和一系列的观察到的事件。我们的测试允许识别携带事件发生信息的时间序列,而无需采用特定的事件检测方法。简而言之,我们测试的时间序列的值分布的分歧,在事件发生后的多个双样本测试方法增加滞后。与相关的测试相比,我们的方法适用于任意域上的时间序列,包括多变量数值、字符串或图形。我们进行了大规模的模拟研究,以表明它优于或等同于我们的任务单变量时间序列的相关测试。我们还展示了我们的方法在社交媒体和智能家居环境数据集上的现实适用性。

英文摘要:

In many application domains, time series are monitored to detect extreme events like technical faults, natural disasters, or disease outbreaks. Unfortunately, it is often non-trivial to select both a time series that is informative about events and a powerful detection algorithm: detection may fail because the detection algorithm is not suitable, or because there is no shared information between the time series and the events of interest. In this work, we thus propose a non-parametric statistical test for shared information between a time series and a series of observed events. Our test allows identifying time series that carry information on event occurrences without committing to a specific event detection methodology. In a nutshell, we test for divergences of the value distributions of the time series at increasing lags after event occurrences with a multiple two-sample testing approach. In contrast to related tests, our approach is applicable for time series over arbitrary domains, including multivariate numeric, strings or graphs. We perform a large-scale simulation study to show that it outperforms or is on par with related tests on our task for univariate time series. We also demonstrate the real-world applicability of our approach on datasets from social media and smart home environments.

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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