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arXiv 2302.13611math.STstat.MEstat.TH
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基于Copula散度测度的随机向量间的参数依赖性

Parametric dependence between random vectors via copula-based divergence measures

Steven De Keyser, Irène Gijbels

摘要:

本文通过$Phi$ -分歧族提出了多组可能大小不同的随机变量之间基于Copula的依赖量化。为此目的提供了一个公理化的框架,之后,我们专注于绝对连续的设置假设Copula密度存在。我们考虑参数和半参数框架,讨论估计程序,并报告所提出的估计的渐近性质。特别是,我们首先集中在高斯copula方法产生明确的和有吸引力的依赖系数的特定选择的$Phi$,这是更适合估计。接下来,考虑一般参数copula族,特别注意嵌套的阿基米德copula,它是随机向量依赖建模的自然选择。通过实例说明了结果。模拟和现实世界的金融数据的应用程序也提供了。

英文摘要:

This article proposes copula-based dependence quantification between multiple groups of random variables of possibly different sizes via the family of $Phi$-divergences. An axiomatic framework for this purpose is provided, after which we focus on the absolutely continuous setting assuming copula densities exist. We consider parametric and semi-parametric frameworks, discuss estimation procedures, and report on asymptotic properties of the proposed estimators. In particular, we first concentrate on a Gaussian copula approach yielding explicit and attractive dependence coefficients for specific choices of $Phi$, which are more amenable for estimation. Next, general parametric copula families are considered, with special attention to nested Archimedean copulas, being a natural choice for dependence modelling of random vectors. The results are illustrated by means of examples. Simulations and a real-world application on financial data are provided as well.

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