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arXiv 1803.09830stat.ME
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相依截断下的Cox回归模型

Cox Regression Model Under Dependent Truncation

Lior Rennert, Sharon X. Xie

摘要:

截断是一种统计现象,发生在许多时间到事件的研究。例如,尸检证实的神经退行性疾病的研究受到固有的左右截断,也称为双截断。当目标是研究风险因素对生存的影响时,当数据受到截断时,不能使用标准Cox回归模型。在Cox回归模型中,现有的调整左截断和右截断的方法要求生存时间和截断时间之间的独立性,这在实践中可能不是合理的假设。我们提出了一个期望最大化算法,放宽了在左,右,或双截断下的Cox回归模型的独立性假设,条件独立的假设。所得的回归系数估计是相合的且渐近正态的。我们证明,通过广泛的模拟,建议的估计有很小的偏差,在大多数实际情况下,有一个较低的均方误差相比,现有的估计。我们实施我们的方法来评估职业对尸检证实的阿尔茨海默病受试者生存的影响。

英文摘要:

Truncation is a statistical phenomenon that occurs in many time to event studies. For example, autopsy-confirmed studies of neurodegenerative diseases are subject to an inherent left and right truncation, also known as double truncation. When the goal is to study the effect of risk factors on survival, the standard Cox regression model cannot be used when the data is subject to truncation. Existing methods which adjust for both left and right truncation in the Cox regression model require independence between the survival times and truncation times, which may not be a reasonable assumption in practice. We propose an expectation-maximization algorithm to relax the independence assumption in the Cox regression model under left, right, or double truncation, to an assumption of conditional independence. The resulting regression coefficient estimators are consistent and asymptotically normal. We demonstrate through extensive simulations that the proposed estimators have little bias and, in most practical situations, have a lower mean-squared error compared to existing estimators. We implement our approach to assess the effect of occupation on survival in subjects with autopsy-confirmed Alzheimer's disease.

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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