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arXiv 2012.14127stat.ME
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关于回归中的删除诊断统计量

On deletion diagnostic statistic in regression

Myung Geun Kim

摘要:

由于实例删除而引起的回归系数向量的最小二乘估计量(LSE)的变化经常用于研究观测对LSE的影响。使用LSE中的变化的协方差阵的Moore-Penrose逆导出LSE中的变化的归一化。这个标准化结果是内部学生化残差的平方。结果表明,库克距离的分子项一般不具有卡方分布,除了一个单一的情况下。给出了一个详细的解释定义库克距离的缩放矩阵的选择的不适当。通过反映由于情况删除的LSE的变化的分布特性,建议了一种新的诊断措施,即标量。最后给出了三个数值例子。

英文摘要:

The change in the least squares estimator (LSE) of a vector of regression coefficients due to a case deletion is often used for investigating the influence of an observation on the LSE. A normalization of the change in the LSE using the Moore-Penrose inverse of the covariance matrix of the change in the LSE is derived. This normalization turns out to be a square of the internally studentized residual. It is shown that the numerator term of Cook's distance does not in general have a chi-squared distribution except for a single case. An elaborate explanation about the inappropriateness of the choice of a scaling matrix defining Cook's distance is given. By reflecting a distributional property of the change in the LSE due to a case deletion, a new diagnostic measure that is a scalar is suggested. Three numerical examples are given for illustration.

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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