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arXiv 0804.1001math.STstat.TH
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商相关性:基于样本的Pearson相关性替代方法

Quotient correlation: A sample based alternative to Pearson's correlation

Zhengjun Zhang

摘要:

商相关性在这里被定义为Pearson相关性的替代,在数据的尾部行为很重要的情况下,它更直观和灵活。它测量非线性相关性,其中常规相关系数通常不适用。它最有用的特性之一是在Fisher $Z$转换检验可能无法得出正确结论的情况下检验非线性相关性时具有高功效的检验统计量。与大多数渐近检验统计量(正态或$χ^2$)不同,该检验统计量具有极限Γ分布(以下称为伽玛检验统计量)。比通常使用的相关性,商相关性可以很容易地和直观地调整到尾部的值。这种调整产生了两个新概念--尾商相关性和尾独立性检验统计量,它们也是伽马统计量。由于极值理论中没有类似的相关系数,也不存在有效的尾部独立性检验统计量,这两个新概念可能会开辟一个新的研究领域。此外,斯皮尔曼的秩相关的替代,基于秩的商相关,也被定义。使用这些新的概念的优点,说明了模拟数据和真实的数据分析的互联网流量。

英文摘要:

The quotient correlation is defined here as an alternative to Pearson's correlation that is more intuitive and flexible in cases where the tail behavior of data is important. It measures nonlinear dependence where the regular correlation coefficient is generally not applicable. One of its most useful features is a test statistic that has high power when testing nonlinear dependence in cases where the Fisher's $Z$-transformation test may fail to reach a right conclusion. Unlike most asymptotic test statistics, which are either normal or $χ^2$, this test statistic has a limiting gamma distribution (henceforth, the gamma test statistic). More than the common usages of correlation, the quotient correlation can easily and intuitively be adjusted to values at tails. This adjustment generates two new concepts--the tail quotient correlation and the tail independence test statistics, which are also gamma statistics. Due to the fact that there is no analogue of the correlation coefficient in extreme value theory, and there does not exist an efficient tail independence test statistic, these two new concepts may open up a new field of study. In addition, an alternative to Spearman's rank correlation, a rank based quotient correlation, is also defined. The advantages of using these new concepts are illustrated with simulated data and a real data analysis of internet traffic.

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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