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双峰t统计量:厚尾对统计推断的影响

研究问题
数据来自不存在有限矩的厚尾分布时,经典t统计量为何可能出现双峰,观测独立性与依赖结构又会怎样改变常规检验的可靠性?
方法与思路
作者分析柯西分布情形,构造可调尾厚与矩存在性的双帕累托分布,并通过截断分布、模拟及适应密度不连续的核方法展开研究。
材料陈述的贡献
摘要称,独立观测是产生双峰的重要条件,截断后即使矩有限也可能保留双峰,显示厚尾环境中直接套用常规检验的风险。
阅读关注点
应核对双峰出现的分布与依赖条件、无限矩环境中相关性概念的定义,以及截断范围和核密度方法如何影响模拟展示。
阅读边界
摘要未给出双峰的完整判据或替代推断方案,不能推断所有厚尾数据都会产生双峰,或所有经典t检验都会失效。

原文摘要

This paper studies the distribution of the classical t-ratio with data generated from distributions with no finite moments and shows how classical testing is affected by bimodality. A key condition in generating bimodality is independence of the observations in the underlying data-generating process (DGP). The paper highlights the strikingly different implications of lack of correlation versus statistical independence in DGPs with infinite moments and shows how standard inference can be invalidated in such cases, thereby pointing to the need for adapting estimation and inference procedures to the special problems induced by thick-tailed (TT) distributions. The paper presents theoretical results for the Cauchy case and develops a new distribution termed the "double-Pareto", which allows the thickness of the tails and the existence of moments to be determined parametrically. It also investigates the relative importance of tail thickness in case of finite moments by using TT distributions truncated on a compact support, showing that bimodality can persist even in such cases. Simulation results highlight the dangers of relying on naive testing in the face of TT distributions. Novel density estimation kernel methods are employed, given that our theoretical results yield cases that exhibit density discontinuities. Copyright The Author(s). Journal compilation Royal Economic Society 2010.

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