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arXiv 2007.14842math.STstat.TH
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基于顺序统计量比的正态变差指数的分布敏感估计

Distribution sensitive estimators of the index of regular variation based on ratios of order statistics

Pavlina K. Jordanova, Milan Stehlí k

摘要:

中心顺序统计量的比率似乎对于估计分布的尾部非常有用,因此,估计数据范围之外的分位数非常有用。1995年,Isabel Fraga Alves研究了当观测随机变量的累积分布函数属于固定广义极值分布的最大-吸引区域时,尾指数参数的三个半参数估计的收敛速率。它们基于两个极端顺序统计量的特定线性变换的比率。在2019年,我们考虑了Pareto情况,并找到了规则变异指数的两个非常简单且无偏的估计。然后,利用中心顺序统计量,我们证明了这些估计具有许多好的性质。然后,我们观察到,虽然假设是不同的,其中一个是等价的阿尔维斯的估计之一。利用中心顺序统计量证明了模型的无偏性、渐近相合性、渐近正态性和渐近有效性。在这里,我们再次使用中心顺序统计量和参数的方法,并获得了分布敏感的估计,在某些特殊情况下的规则变化的指数。然后,我们找到了保证这些估计是无偏的,一致的和渐近正态的条件。通过仿真研究的结果描绘。

英文摘要:

Ratios of central order statistics seem to be very useful for estimating the tail of the distributions and therefore, quantiles outside the range of the data. In 1995 Isabel Fraga Alves investigated the rate of convergence of three semi-parametric estimators of the parameter of the tail index in case when the cumulative distribution function of the observed random variable belongs to the max-domain of attraction of a fixed Generalized Extreme Value Distribution. They are based on ratios of specific linear transformations of two extreme order statistics. In 2019 we considered Pareto case and found two very simple and unbiased estimators of the index of regular variation. Then, using the central order statistics we showed that these estimators have many good properties. Then, we observed that although the assumptions are different, one of them is equivalent to one of Alves's estimators. Using central order statistics we proved unbiasedness, asymptotic consistency, asymptotic normality and asymptotic efficiency. Here we use again central order statistics and a parametric approach and obtain distribution sensitive estimators of the index of regular variation in some particular cases. Then, we find conditions which guarantee that these estimators are unbiased, consistent and asymptotically normal. The results are depicted via simulation study.

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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