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arXiv 1503.05077math.STstat.TH
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尾指数估计、集中度和自适应性

Tail index estimation, concentration and adaptivity

Stéphane Boucheron, Maud Thomas

摘要:

本文提出了一种基于Lespki模型选择方法的自适应Hill估计。这个简单的数据驱动的索引选择方法,以满足预言不等式,并检查,以实现最近由Carpentier和Kim推导出的下界。为了建立预言不等式,我们得到了Hill估计的非渐近方差界和浓度不等式。这些浓度不等式来自Talagrand的浓度不等式的光滑函数的独立指数分布的随机变量结合极值理论的三个工具:分位数变换,Karamata的表示缓慢变化的功能,和Rényi的表征的顺序统计量的指数样本。这种计算和概念上简单的方法的性能说明使用蒙特卡罗模拟。

英文摘要:

This paper presents an adaptive version of the Hill estimator based on Lespki's model selection method. This simple data-driven index selection method is shown to satisfy an oracle inequality and is checked to achieve the lower bound recently derived by Carpentier and Kim. In order to establish the oracle inequality, we derive non-asymptotic variance bounds and concentration inequalities for Hill estimators. These concentration inequalities are derived from Talagrand's concentration inequality for smooth functions of independent exponentially distributed random variables combined with three tools of Extreme Value Theory: the quantile transform, Karamata's representation of slowly varying functions, and Rényi's characterisation of the order statistics of exponential samples. The performance of this computationally and conceptually simple method is illustrated using Monte-Carlo simulations.

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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