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arXiv 1708.01686math.STstat.TH
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指数广义Pareto分布的性质及其在极值理论中的应用

Exponentiated Generalized Pareto Distribution: Properties and applications towards Extreme Value Theory

Se Yoon Lee, Joseph H. T. Kim

摘要:

广义帕累托分布(GPD)在许多应用中对重尾现象的建模起着核心作用。然而,将GPD应用于实际数据集是一项重要的任务。文献中建议的一种研究尾部行为的常见方法是对原始数据集取对数,以减少样本变异性。受此启发,我们提出并研究了指数广义帕累托分布(exGPD),这是通过对数变换的GPD变量创建。在引入exGPD之后,我们导出了各种分布量,包括矩母函数,尾部风险度量。作为一个应用程序,我们还开发了一个图作为希尔图的替代方案,以确定重尾数据集的尾指数,基于exGPD的矩匹配。模拟和实际数据集的各种数值分析表明,所提出的情节效果良好。

英文摘要:

The Generalized Pareto Distribution (GPD) plays a central role in modelling heavy tail phenomena in many applications. Applying the GPD to actual datasets however is a non-trivial task. One common way suggested in the literature to investigate the tail behaviour is to take logarithm to the original dataset in order to reduce the sample variability. Inspired by this, we propose and study the Exponentiated Generalized Pareto Distribution (exGPD), which is created via log-transform of the GPD variable. After introducing the exGPD we derive various distributional quantities, including the moment generating function, tail risk measures. As an application we also develop a plot as an alternative to the Hill plot to identify the tail index of heavy tailed datasets, based on the moment matching for the exGPD. Various numerical analyses with both simulated and actual datasets show that the proposed plot works well.

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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