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arXiv 1602.00769stat.ME
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对称和对数对称线性回归模型的小样本检验推断

Small-sample testing inference in symmetric and log-symmetric linear regression models

Francisco M. C. Medeiros, Silvia L. P. Ferrari

摘要:

本文讨论了中小样本对称和对数对称线性回归模型的假设检验问题。我们专注于四个测试,即沃尔德,似然比,得分,梯度测试。这些检验依赖于渐近结果,当样本量不足以保证检验统计量的精确分布与相应的卡方渐近分布之间的良好一致性时,这些检验是不可靠的。Bartlett和Bartlett型校正通常会减弱测试的尺寸失真。这些校正在对称线性回归模型中的似然比和得分检验的文献中可用。在这里,我们推导出梯度测试的Bartlett型校正。我们证明了这些修正对对数对称线性回归模型也是有效的。我们数值比较各种测试,并引导测试,通过模拟。我们的研究结果表明,校正和自举测试表现出I型概率误差接近所选择的标称水平,几乎没有功率损耗。分析校正的测试,包括Bartlett校正的梯度测试在本文中得出的,执行以及自举测试的优势,不需要计算密集型计算。我们提出了两个真实的数据应用程序来说明修改后的测试的有用性。保留字:对称回归模型;巴特利特校正; Bartlett型校正; Bootstrap;对数对称回归模型;梯度统计;评分统计;似然比统计量; Wald统计量

英文摘要:

This paper deals with the issue of testing hypothesis in symmetric and log-symmetric linear regression models in small and moderate-sized samples. We focus on four tests, namely the Wald, likelihood ratio, score, and gradient tests. These tests rely on asymptotic results and are unreliable when the sample size is not large enough to guarantee a good agreement between the exact distribution of the test statistic and the corresponding chi-squared asymptotic distribution. Bartlett and Bartlett-type corrections typically attenuate the size distortion of the tests. These corrections are available in the literature for the likelihood ratio and score tests in symmetric linear regression models. Here, we derive a Bartlett-type correction for the gradient test. We show that the corrections are also valid for the log-symmetric linear regression models. We numerically compare the various tests, and bootstrapped tests, through simulations. Our results suggest that the corrected and bootstrapped tests exhibit type I probability error closer to the chosen nominal level with virtually no power loss. The analytically corrected tests, including the Bartlett-corrected gradient test derived in this paper, perform as well as the bootstrapped tests with the advantage of not requiring computationally-intensive calculations. We present two real data applications to illustrate the usefulness of the modified tests. Keywords: Symmetric regression models; Bartlett correction; Bartlett-type correction; Bootstrap; Log-symmetric regression models; gradient statistic; score statistic; likelihood ratio statistic; Wald statistic.

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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