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arXiv 2201.10770stat.MEstat.ML
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基于交叉验证的Cox模型测试误差的置信区间

Confidence intervals for the Cox model test error from cross-validation

Min Woo Sun, Robert Tibshirani

AI总结:

针对交叉验证估计Cox模型测试误差时置信区间覆盖率不足的问题,将嵌套CV思路推广至Cox比例风险模型,探索该场景下测试误差的多种选择,以提升置信区间覆盖率。

摘要:

交叉验证(CV)是统计学习中用于估计模型测试误差的最广泛使用的技术之一,但其行为尚未被完全理解。已有研究表明,使用CV估计值构建的测试误差标准置信区间的覆盖率可能低于标称水平。出现这一现象的原因是,在CV过程中每个样本都同时用于训练和测试流程,因此误差的CV估计值会产生相关性。若不考虑这种相关性,方差的估计值会小于其真实值。缓解这一问题的一种方法是改用嵌套CV来估计预测误差的均方误差。已有研究证明,与标准CV推导的区间相比,该方法能实现更优的覆盖率。在本研究中,我们将嵌套CV的思路推广到Cox比例风险模型,并探索了该场景下测试误差的多种选择方案。

英文摘要:

Cross-validation (CV) is one of the most widely used techniques in statistical learning for estimating the test error of a model, but its behavior is not yet fully understood. It has been shown that standard confidence intervals for test error using estimates from CV may have coverage below nominal levels. This phenomenon occurs because each sample is used in both the training and testing procedures during CV and as a result, the CV estimates of the errors become correlated. Without accounting for this correlation, the estimate of the variance is smaller than it should be. One way to mitigate this issue is by estimating the mean squared error of the prediction error instead using nested CV. This approach has been shown to achieve superior coverage compared to intervals derived from standard CV. In this work, we generalize the nested CV idea to the Cox proportional hazards model and explore various choices of test error for this setting.

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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