arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1811.00535math.STstat.TH
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Cox回归模型的高维稳健推断

High Dimensional Robust Inference for Cox Regression Models

Shengchun Kong, Zhuqing Yu, Xianyang Zhang, Guang Cheng

摘要:

本文基于Lin和Wei [1989]的低维结果,考虑了可能错误指定的Cox比例风险模型的高维推断。基于对数偏似然函数提出了一种去稀疏Lasso估计,并证明了该估计收敛于一个伪真参数向量。有趣的是,真参数的稀疏性可以从上述限制参数的稀疏性推断出来。此外,上述(非稀疏)估计的每个组件被证明是渐近正态的方差,可以一致估计,即使在模型误指定。在某些情况下,这种渐进分布会产生有效的统计推断程序,并通过数值示例说明其经验性能。

英文摘要:

We consider high-dimensional inference for potentially misspecified Cox proportional hazard models based on low dimensional results by Lin and Wei [1989]. A de-sparsified Lasso estimator is proposed based on the log partial likelihood function and shown to converge to a pseudo-true parameter vector. Interestingly, the sparsity of the true parameter can be inferred from that of the above limiting parameter. Moreover, each component of the above (non-sparse) estimator is shown to be asymptotically normal with a variance that can be consistently estimated even under model misspecifications. In some cases, this asymptotic distribution leads to valid statistical inference procedures, whose empirical performances are illustrated through numerical examples.

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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