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arXiv 2103.09305stat.ME
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生存数据的贝叶斯非参数混合最优分层

Optimal stratification of survival data via Bayesian nonparametric mixtures

Riccardo Corradin, Luis Enrique Nieto-Barajas, Bernardo Nipoti

摘要:

分层比例风险模型代表了一种简单的解决方案,可以解释数据中的异质性,同时保持对风险函数的乘法效应。层通常通过诉诸于分类协变量所取的值来先验地定义。提出了一个一般框架,它允许分层的通用加速寿命模型,包括作为一个特殊情况下的威布尔比例风险模型。考虑到分层可能以不同的基线生存率以及预测因子的不同影响为特征,后验确定分层。这是通过考虑贝叶斯非参数混合模型及其在数据分区空间上诱导的后验分布来实现的。最优分层,然后确定的信息准则的变化,反过来,层特定的推理进行。所提出的方法的性能和它的鲁棒性的存在下,右删失的意见进行了研究,通过广泛的模拟研究。从马萨诸塞大学艾滋病研究单位IMPACT研究中提取的数据集的分析提供了进一步的说明。

英文摘要:

The stratified proportional hazards model represents a simple solution to account for heterogeneity within the data while keeping the multiplicative effect on the hazard function. Strata are typically defined a priori by resorting to the values taken by a categorical covariate. A general framework is proposed, which allows for the stratification of a generic accelerated life time model, including as a special case the Weibull proportional hazard model. The stratification is determined a posteriori by taking into account that strata might be characterized by different baseline survivals as well as different effects of the predictors. This is achieved by considering a Bayesian nonparametric mixture model and the posterior distribution it induces on the space of data partitions. The optimal stratification is then identified by means of the variation of information criterion and, in turn, stratum-specific inference is carried out. The performance of the proposed method and its robustness to the presence of right-censored observations are investigated by means of an extensive simulation study. A further illustration is provided by the analysis of a data set extracted from the University of Massachusetts AIDS Research Unit IMPACT Study.

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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