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arXiv 2402.07022stat.ME
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当治愈状态部分已知时条件生存函数的乘积极限估计量

A product-limit estimator of the conditional survival function when cure status is partially known

Wende C. Safari, Ignacio López-de-Ullibarri, M. Amalia Jácome

AI总结:

针对治愈状态部分已知的右删失数据,提出混合治愈模型中条件生存函数的非参数估计量,证明其渐近性质与方差减小优势,并通过模拟与肉瘤患者真实数据验证了其优越性。

摘要:

针对治愈状态部分已知时的右删失数据,我们提出了一种混合治愈模型中条件生存函数的非参数估计量。该估计量是为单一连续协变量设定的,但可扩展至多个协变量。它扩展了忽略治愈状态信息的Beran (1981) 估计量。我们获得了几乎必然表示,并由此推导出该估计量的强一致性和渐近正态性。偏差和方差的渐近表达式表明,相较于Beran的估计量,方差有所减小。模拟研究表明,若合适地选择带宽参数,在广泛的协变量取值范围内,我们的估计量优于其他估计量。我们提出了一种自助法带宽选择器。最后,将所提估计量应用于研究肉瘤患者生存的真实数据集。

英文摘要:

We introduce a nonparametric estimator of the conditional survival function in the mixture cure model for right censored data when cure status is partially known. The estimator is developed for the setting of a single continuous covariate but it can be extended to multiple covariates. It extends the estimator of Beran (1981), which ignores cure status information. We obtain an almost sure representation, from which the strong consistency and asymptotic normality of the estimator are derived. Asymptotic expressions of the bias and variance demonstrate a reduction in the variance with respect to Beran's estimator. A simulation study shows that, if the bandwidth parameter is suitably chosen, our estimator performs better than others for an ample range of covariate values. A bootstrap bandwidth selector is proposed. Finally, the proposed estimator is applied to a real dataset studying survival of sarcoma patients.

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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