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arXiv 1709.10074stat.AP
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模拟具有时变协变量和右删失结果的现实复杂的比较有效性研究

Simulating realistically complex comparative effectiveness studies with time-varying covariates and right-censored outcomes

Maria E. Montez-Rath, Kristopher Kapphahn, Maya B. Mathur, Natasha Purington, Vilija R. Joyce, Manisha Desai

摘要:

模拟研究对于评估和发展分析复杂问题的统计方法是有用的。方法的性能可能会受到真实场景中存在的多种复杂性的影响。然而,为此目的生成足够真实的数据可能具有挑战性。我们关于艾滋病毒治疗方案对心血管疾病风险的相对有效性的研究-涉及对艾滋病毒患者的纵向评估-就是这样一个例子。必须考虑协变量之间和受试者内部随时间的相关性结构,以及对感兴趣的结果、至心肌梗死的时间进行右删失。模拟协变量的一个挑战是为混合类型的变量(连续、二进制或多分类)引入联合分布。另一个挑战是纳入受试者内相关性,其中一些变量可能随时间变化,而其他变量可能保持不变。为了解决这些问题,我们扩展了Demirtas和Doganay(2012)的工作。确定一个模型,从该模型中模拟右删失结果作为这些协变量的函数,建立在Sylvestre和Abrahamowicz(2007)开发的工作基础上。在本文中,我们描述了一个有凝聚力和用户友好的方法,伴随着R代码来模拟比较有效性的研究与右删失的结果是随时间变化的协变量的函数。

英文摘要:

Simulation studies are useful for evaluating and developing statistical methods for the analyses of complex problems. Performance of methods may be affected by multiple complexities present in real scenarios. Generating sufficiently realistic data for this purpose, however, can be challenging. Our study of the comparative effectiveness of HIV protocols on the risk of cardiovascular disease -- involving the longitudinal assessment of HIV patients -- is such an example. The correlation structure across covariates and within subjects over time must be considered as well as right-censoring of the outcome of interest, time to myocardial infarction. A challenge in simulating the covariates is to incorporate a joint distribution for variables of mixed type -- continuous, binary or polytomous. An additional challenge is incorporating within-subject correlation where some variables may vary over time and others may remain static. To address these issues, we extend the work of Demirtas and Doganay (2012). Identifying a model from which to simulate the right-censored outcome as a function of these covariates builds on work developed by Sylvestre and Abrahamowicz (2007). In this paper, we describe a cohesive and user-friendly approach accompanied by R code to simulate comparative effectiveness studies with right-censored outcomes that are functions of time-varying covariates.

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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