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Robust Fits for Copula Models

机译:鲁棒性适合Copula模型

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摘要

In this article, we obtain robust estimators for copula parameters through the minimization of weighted goodness-of-fit statistics. Different weight functions emphasize different regions on the unit square and are able to handle different locations of model violation. The resulting WMDE estimators are compared to the classical maximum likelihood estimators MLE, and to their weighted version WMLE, an estimator obtained in two steps. The weights obtained in the first step by the application of a high breakdown point scatter matrix estimator are used to identify atypical points. All estimators are compared in a comprehensive simulation study. For each ε-contaminated parametric copula family considered, we showed that there is a robust estimator improving over the MLE and able to capture the correct strength of dependence of the data, despite the contamination percentual and location, and the sample size.
机译:在本文中,我们通过最小化加权拟合优度统计数据来获得对copula参数的鲁棒估计。不同的权重函数会在单位正方形上强调不同的区域,并且能够处理违反模型的不同位置。将得到的WMDE估计量与经典最大似然估计量MLE以及加权加权WMLE进行比较,WMLE是分两步获得的。通过应用高击穿点散点矩阵估计器在第一步中获得的权重用于标识非典型点。在全面的模拟研究中比较所有估计量。对于所考虑的每个受ε污染的参数系动词族,我们显示了一个鲁棒的估计器,可以对MLE进行改进,并且尽管存在污染百分率和位置以及样本量,也可以捕获数据的正确依赖性。

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