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arXiv 2006.16657stat.ME
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线性回归模型的稳健自适应修正极大似然估计

A Robust Adaptive Modified Maximum Likelihood Estimator for the Linear Regression Model

Sukru Acitas, Peter Filzmoser, Birdal Senoglu

摘要:

在线性回归中,如果误差服从正态分布,则最小二乘(LS)估计具有一定的最优性。这一假设在实践中经常被违反,部分原因是数据离群值。稳健估计可以很好地解决这一问题,因此在实际中得到了广泛的应用。回归稳健估计的一个例子是自适应修正极大似然(AMML)估计(Donmez,2010)。然而,它们对$x$离群值(所谓的杠杆点)不稳健。在这项研究中,我们提出了一个新的回归估计,通过采用适当的加权方案的AMML估计方法。由此产生的估计被称为鲁棒AMML(RAMML),因为它不仅对y离群值是鲁棒的,而且对x离群值是鲁棒的。通过仿真研究,比较了RAMML估计与MM、最小截尾平方(LTS)和S。结果表明,根据均方误差(MSE)准则,RAMML估计在大多数情况下是优选的。两个数据集从文献中也进行了分析,以显示RAMML估计方法的实施。

英文摘要:

In linear regression, the least squares (LS) estimator has certain optimality properties if the errors are normally distributed. This assumption is often violated in practice, partly caused by data outliers. Robust estimators can cope with this situation and thus they are widely used in practice. One example of robust estimators for regression are adaptive modified maximum likelihood (AMML) estimators (Donmez, 2010). However, they are not robust to $x$ outliers, so-called leverage points. In this study, we propose a new regression estimator by employing an appropriate weighting scheme in the AMML estimation method. The resulting estimator is called robust AMML (RAMML) since it is not only robust to y outliers but also to x outliers. A simulation study is carried out to compare the performance of the RAMML estimator with some existing robust estimators such as MM, least trimmed squares (LTS) and S. The results show that the RAMML estimator is preferable in most settings according to the mean squared error (MSE) criterion. Two data sets taken from the literature are also analyzed to show the implementation of the RAMML estimation methodology.

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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