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arXiv 1102.0110math.STstat.TH
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尾Copula的乘子自举及其应用

Multiplier bootstrap of tail copulas with applications

Axel Bücher, Holger Dette

摘要:

对于下尾和上尾Copula函数的估计问题,我们提出了两种自举方法来逼近相应的经验尾Copula函数的分布。第一种方法使用了一个乘子引导的经验尾copula过程,并需要估计的尾copula的偏导数。第二种方法避免了这种估计问题,并在二维经验分布函数和边缘分布的估计中使用乘数。对于这两个乘数引导程序,我们证明了一致性。对于这些调查,我们证明了在尾copula估计的文献中存在连续的偏导数的共同假设是如此的限制,使得尾copula对应于尾独立性是唯一的尾copula与此属性。此外,我们能够解决这个问题,并证明弱收敛的经验尾copula过程下满足许多常用的模型的非限制性光滑的假设。这些结果被应用在几个统计问题,包括最小距离估计和拟合优度检验。

英文摘要:

For the problem of estimating lower tail and upper tail copulas, we propose two bootstrap procedures for approximating the distribution of the corresponding empirical tail copulas. The first method uses a multiplier bootstrap of the empirical tail copula process and requires estimation of the partial derivatives of the tail copula. The second method avoids this estimation problem and uses multipliers in the two-dimensional empirical distribution function and in the estimates of the marginal distributions. For both multiplier bootstrap procedures, we prove consistency. For these investigations, we demonstrate that the common assumption of the existence of continuous partial derivatives in the the literature on tail copula estimation is so restrictive, such that the tail copula corresponding to tail independence is the only tail copula with this property. Moreover, we are able to solve this problem and prove weak convergence of the empirical tail copula process under nonrestrictive smoothness assumptions that are satisfied for many commonly used models. These results are applied in several statistical problems, including minimum distance estimation and goodness-of-fit testing.

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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