arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1702.01696math.STstat.TH
收藏

剖析多元极值指数和尾相关

Dissecting the multivariate extremal index and tail dependence

Helena Ferreira, Marta Ferreira

摘要:

极值理论中的一个中心问题集中在适当的条件下,这样,著名的结果的极限分布的最大i.i.d.序列可以应用于静止序列。在这种情况下,极值指数出现作为一个关键参数,以捕捉的最大值的限制分布的时间依赖性的效果。多元极值指数对应于这一概念到多元背景的推广,并影响边缘序列内和它们之间的尾部依赖结构。由于它是一个函数,因此推理变得更加困难,因此获得特征是很重要的,即基于边缘依赖的边界更容易估计。在这项工作中,我们提出了两个分解,强调不同类型的信息中包含的多元极值指数,一个上极限比文献中发现的更好,我们分析了它的作用,依赖于一个固定序列的分量最大值的限制模型。我们将说明的结果与应用程序中公认的兴趣的例子。

英文摘要:

A central issue in the theory of extreme values focuses on suitable conditions such that the well-known results for the limiting distributions of the maximum of i.i.d. sequences can be applied to stationary ones. In this context, the extremal index appears as a key parameter to capture the effect of temporal dependence on the limiting distribution of the maxima. The multivariate extremal index corresponds to a generalization of this concept to a multivariate context and affects the tail dependence structure within the marginal sequences and between them. As it is a function, the inference becomes more difficult, and it is therefore important to obtain characterizations, namely bounds based on the marginal dependence that are easier to estimate. In this work we present two decompositions that emphasize different types of information contained in the multivariate extremal index, an upper limit better than those found in the literature and we analyze its role in dependence on the limiting model of the componentwise maxima of a stationary sequence. We will illustrate the results with examples of recognized interest in applications.

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。

↑