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arXiv 1502.05600stat.ME
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基于稳健估计的椭圆对称性条件检验

Conditional tests for elliptical symmetry using robust estimators

Ana M. Bianco, Graciela Boente, Isabel M. Rodrigues

摘要:

本文提出了一种方法来检验假设,即当使用鲁棒位置和散布估计代替样本均值和协方差阵时,数据的基本分布是椭圆形的。在温和的假设下,包括椭圆分布没有一阶矩,我们得到的检验统计量的渐近行为下的原假设和特殊的替代品。数值实验允许在各种椭圆分布和不同替代方案下将基于样本均值和协方差阵的检验行为与基于稳健估计量的检验行为进行比较。该比较不仅着眼于观察到的水平和把握度,而且我们使用了大小校正的相对精确把握度,该把握度提供了一种评估检验统计量检测替代品技能的工具。我们还提供了与其他竞争测试的数值比较。

英文摘要:

This paper presents a procedure for testing the hypothesis that the underlying distribution of the data is elliptical when using robust location and scatter estimators instead of the sample mean and covariance matrix. Under mild assumptions that include elliptical distributions without first moments, we derive the test statistic asymptotic behaviour under the null hypothesis and under special alternatives. Numerical experiments allow to compare the behaviour of the tests based on the sample mean and covariance matrix with that based on robust estimators, under various elliptical distributions and different alternatives. This comparison was done looking not only at the observed level and power but we rather use the size-corrected relative exact power which provides a tool to assess the test statistic skill to detect alternatives. We also provide a numerical comparison with other competing tests.

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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