arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1206.4685stat.MEcs.LGstat.AP
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Sparse-GEV:多元极值时间序列建模的稀疏潜空间模型

Sparse-GEV: Sparse Latent Space Model for Multivariate Extreme Value Time Serie Modeling

University of Southern California(南加州大学);IBM T.J. Watson Research Center(IBM T.J. Watson研究中心)

Yan Liu, Taha Bahadori, Hongfei Li

摘要:

在时间序列模型的许多应用中,如气候分析、社交媒体分析等,我们往往对极端事件感兴趣,如热浪、阵风、突发话题等。这些时间序列数据通常呈现重尾分布而不是高斯分布。由于对数据分布的假设差异很大,而且缺乏足够的极端事件过去数据,这对现有方法构成了巨大挑战。在本文中,我们提出了Sparse-GEV模型,一个潜在的状态模型的基础上的极值建模理论,自动学习稀疏的时间依赖性,并作出预测。我们的模型是理论上有意义的,因为它是第一个模型,学习稀疏的时间依赖性之间的多元极值时间序列。我们证明了我们的算法的性能优越的国家的最先进的方法,包括格兰杰因果关系,copula方法和转移熵,一个合成数据集,一个气候数据集和两个Twitter数据集。

英文摘要:

In many applications of time series models, such as climate analysis and social media analysis, we are often interested in extreme events, such as heatwave, wind gust, and burst of topics. These time series data usually exhibit a heavy-tailed distribution rather than a Gaussian distribution. This poses great challenges to existing approaches due to the significantly different assumptions on the data distributions and the lack of sufficient past data on extreme events. In this paper, we propose the Sparse-GEV model, a latent state model based on the theory of extreme value modeling to automatically learn sparse temporal dependence and make predictions. Our model is theoretically significant because it is among the first models to learn sparse temporal dependencies among multivariate extreme value time series. We demonstrate the superior performance of our algorithm to the state-of-art methods, including Granger causality, copula approach, and transfer entropy, on one synthetic dataset, one climate dataset and two Twitter datasets.

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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