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arXiv 2603.09768math.STstat.TH
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Chatterjee 和 Blest 排列相关性之间的精确区域

The exact region between Chatterjee's and Blest's rank correlations

University of Freiburg(弗赖堡大学)

Marcus Rockel

AI总结:

本文研究了 Chatterjee 和 Blest 排列相关性之间的精确区域,通过受约束优化问题和极值 copula 家族推导出闭式表达式,明确刻画了两者之间的关系。

摘要:

精确的排列相关性区域描述了在相同的 copula 上,两个依赖度量可以同时达到的所有值对的集合,从而得到它们之间的尖锐不等式。在本文中,我们确定了 Chatterjee 的排列相关性 ξ 和 Blest 的排列相关性 ν 在所有双变量 copula 类别上的精确区域。我们的方法基于一个受约束的优化问题,其解由 Karush-Kuhn-Tucker 条件所刻画。这导致了一个新的极值 copula 家族,该家族唯一地追踪了区域的边界。对于这个家族,我们推导出 ξ 和 ν 的闭式表达式,这些表达式提供了精确可达区域的显式参数化。

英文摘要:

Exact regions between rank correlations describe the set of all pairs of values that two dependence measures can attain simultaneously on the same copula and thus yield sharp inequalities between them. In this paper, we determine the exact region between Chatterjee's rank correlation $ξ$ and Blest's rank correlation $ν$ over the class of all bivariate copulas. Our approach is based on a constrained optimization problem whose solution is characterized by Karush--Kuhn--Tucker conditions. This leads to a novel extremal copula family that uniquely traces the boundary of the region. For this family, we derive closed-form expressions for both $ξ$ and $ν$, which provide an explicit parametrization of the exact attainable region.

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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