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arXiv 1407.0230stat.ME
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嵌套阿基米德copula:一类新的非参数树结构估计

Nested Archimedean copulas: a new class of nonparametric tree structure estimators

Nathan Uyttendaele

摘要:

任何嵌套阿基米德copula定义从一个有根的系统发生树,为这一类新的非参数估计。这个新类的估计器依赖于两步过程,首先构建二叉树,然后在必要时折叠以给出目标树结构的估计。从这个类的估计的几个例子,这些估计的性能,以及唯一已知的可比估计,评估通过模拟研究,涉及目标结构在不同的维度,显示新的估计,除了更快,通常提供更好的性能。此外,在给定的例子中的估计量从新的类,一个表现最好的是应用于三个数据集:482名学生和他们的结果,各种考试,26个欧洲国家在1979年和工人的百分比在不同的经济活动,和104个国家在2002年的各种健康相关的变量。由此产生的估计树为分析数据提供了有价值的见解。嵌套阿基米德copula一般的未来也进行了讨论。

英文摘要:

Any nested Archimedean copula is defined starting from a rooted phylogenetic tree, for which a new class of nonparametric estimators is presented. An estimator from this new class relies on a two-step procedure where first a binary tree is built and second is collapsed if necessary to give an estimate of the target tree structure. Several examples of estimators from this class are given and the performance of each of these estimators, as well as of the only known comparable estimator, is assessed by means of a simulation study involving target structures in various dimensions, showing that the new estimators, besides being faster, usually offer better performance as well. Further, among the given examples of estimators from the new class, one of the best performing one is applied on three datasets: 482 students and their results to various examens, 26 European countries in 1979 and the percentage of workers employed in different economic activities, and 104 countries in 2002 for which various health-related variables are available. The resulting estimated trees offer valuable insights on the analyzed data. The future of nested Archimedean copulas in general is also discussed.

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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