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arXiv 2408.14036stat.ME
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变平面回归中的稳健子群分类器学习与检验

Robust subgroup-classifier learning and testing in change-plane regressions

Xu Liu, Jian Huang, Yong Zhou, Xiao Zhang

AI总结:

针对重尾误差变平面回归,提出基于平滑Huber损失学习的稳健子群分类器及稳健加权平方得分检验统计量,实现次高斯尾估计并克服高维功效损失,有效支持个体化治疗推荐。

摘要:

本文考虑了具有重尾误差的变平面回归中的稳健子群分类器学习与检验问题,该方法能够识别子群,作为为个体化治疗提供最优建议的基础。通过平滑指示函数提出了一种新的子群分类器,并通过最小化平滑 Huber 损失进行学习。建立了估计量的非渐近性质和 Bahadur 表示,其中提出的分组差异参数和基线参数的估计量实现了次高斯尾。所考虑的假设检验属于在原假设下某些参数不可识别的检验问题类别。当分组参数的维度较大时,经典的平方得分检验统计量的上确界在实践中可能会失去功效,因此为了克服这一缺陷并充分利用数据的重尾误差分布,提出了一种稳健的平方得分检验统计量的加权平均,当选择适当的权重时,该统计量可以实现闭式解。推导了所提出的稳健检验统计量在原假设和备择假设下的渐近分布。所提出的稳健子群分类器和检验统计量在有限样本上表现良好,并且通过将其应用于医疗数据集进一步展示了其性能。所提出的程序可直接应用于推荐最优的个体化治疗。

英文摘要:

Considered here are robust subgroup-classifier learning and testing in change-plane regressions with heavy-tailed errors, which can identify subgroups as a basis for making optimal recommendations for individualized treatment. A new subgroup classifier is proposed by smoothing the indicator function, which is learned by minimizing the smoothed Huber loss. Nonasymptotic properties and the Bahadur representation of estimators are established, in which the proposed estimators of the grouping difference parameter and baseline parameter achieve sub-Gaussian tails. The hypothesis test considered here belongs to the class of test problems for which some parameters are not identifiable under the null hypothesis. The classic supremum of the squared score test statistic may lose power in practice when the dimension of the grouping parameter is large, so to overcome this drawback and make full use of the data's heavy-tailed error distribution, a robust weighted average of the squared score test statistic is proposed, which achieves a closed form when an appropriate weight is chosen. Asymptotic distributions of the proposed robust test statistic are derived under the null and alternative hypotheses. The proposed robust subgroup classifier and test statistic perform well on finite samples, and their performances are shown further by applying them to a medical dataset. The proposed procedure leads to the immediate application of recommending optimal individualized treatments.

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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