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arXiv 1901.03212stat.ME
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一种灵活的生存分析参数化建模框架

A Flexible Parametric Modelling Framework for Survival Analysis

Kevin Burke, M. C. Jones, Angela Noufaily

摘要:

我们引入了一个通用的、灵活的、参数化的生存建模框架,该框架包括风险函数的关键形状(恒定、增加、减少、先上后下、先下后上)、各种常见的生存分布(对数逻辑、Burr类型XII、Weibull、Gompertz),并包括缺陷分布(即,治愈模型)。这种普遍性是使用四个基本的分布参数:两个尺度类型参数和两个形状参数。推广到协变量依赖性,尺度型回归分量对应于加速失效时间(AFT)和比例风险(PH)模型。因此,这个一般公式统一了最流行的生存模型,使我们能够考虑生存数据可能的建模选择的实际价值。此外,根据我们提出的灵活的基线分布,我们提倡使用多参数回归,其中多个分布参数取决于协变量-而不是通常的惯例,只有一个协变量依赖(尺度)参数。虽然有许多选择,我们建议通过两个尺度参数中的一个或另一个引入协变量,其中包括AFT和PH模型,结合一个“幂”形状参数,允许更复杂的非AFT/非PH效应,而另一个形状参数保持协变量独立,并处理基线分布的自动选择。我们探讨推理问题的模拟,无论是有和没有协变量,特别关注的证据有关的需要,或以其他方式,包括AFT和PH参数。我们通过使用来自肺癌研究和黑色素瘤研究的数据调查治疗组之间的差异来说明我们的建模框架的功效。删失被容纳在整个。

英文摘要:

We introduce a general, flexible, parametric survival modelling framework which encompasses key shapes of hazard function (constant, increasing, decreasing, up-then-down, down-then-up), various common survival distributions (log-logistic, Burr type XII, Weibull, Gompertz), and includes defective distributions (i.e., cure models). This generality is achieved using four basic distributional parameters: two scale-type parameters and two shape parameters. Generalising to covariate dependence, the scale-type regression components correspond to accelerated failure time (AFT) and proportional hazards (PH) models. Therefore, this general formulation unifies the most popular survival models which allows us to consider the practical value of possible modelling choices for survival data. Furthermore, in line with our proposed flexible baseline distribution, we advocate the use of multi-parameter regression in which more than one distributional parameter depends on covariates - rather than the usual convention of having a single covariate-dependent (scale) parameter. While many choices are available, we suggest introducing covariates through just one or other of the two scale parameters, which covers AFT and PH models, in combination with a `power' shape parameter, which allows for more complex non-AFT/non-PH effects, while the other shape parameter remains covariate-independent, and handles automatic selection of the baseline distribution. We explore inferential issues in simulations, both with and without a covariate, with particular focus on evidence concerning the need, or otherwise, to include both AFT and PH parameters. We illustrate the efficacy of our modelling framework by investigating differences between treatment groups using data from a lung cancer study and a melanoma study. Censoring is accommodated throughout.

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