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分类依据与纠错

AI 根据所提供的论文材料归类:摘要明确讨论临床试验的协变量自适应随机治疗分配及平衡性质,属于因果推断相关的实验设计方向。

反馈分类问题

正在核对关联版本…

代码、数据与补充材料

正在核对对应版本的资源…

关注这篇论文的作者
Yanqing Hu
Feifang Hu

协变量自适应随机化的渐近性质

研究问题
临床试验中如何同时控制不同层面的治疗分配不平衡,避免分层过多或传统最小化方法造成的整体与层内失衡?
方法与思路
作者提出新的协变量自适应分配设计,以马尔可夫链研究层内不平衡的联合过程,并在一定条件下证明其正再生性。
材料陈述的贡献
摘要称新设计能够控制多类不平衡,相关马尔可夫链结果支持更均衡的分配,并以大量模拟展示设计优势及理论工具的用途。
阅读关注点
应核对分配概率与各类平衡指标、正再生性所需条件,以及模拟中的分层规模、比较方法和具体平衡评价标准。
阅读边界
仅据版本未注明的OpenAlex索引摘要;理论条件和模拟数值未提供,更均衡的分配不自动保证治疗效应检验具有更高功效。

原文摘要

Balancing treatment allocation for influential covariates is critical in clinical trials. This has become increasingly important as more and more biomarkers are found to be associated with different diseases in translational research (genomics, proteomics and metabolomics). Stratified permuted block randomization and minimization methods [Pocock and Simon Biometrics 31 (1975) 103–115, etc.] are the two most popular approaches in practice. However, stratified permuted block randomization fails to achieve good overall balance when the number of strata is large, whereas traditional minimization methods also suffer from the potential drawback of large within-stratum imbalances. Moreover, the theoretical bases of minimization methods remain largely elusive. In this paper, we propose a new covariate-adaptive design that is able to control various types of imbalances. We show that the joint process of within-stratum imbalances is a positive recurrent Markov chain under certain conditions. Therefore, this new procedure yields more balanced allocation. The advantages of the proposed procedure are also demonstrated by extensive simulation studies. Our work provides a theoretical tool for future research in this area.

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