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AI 根据所提供的论文材料归类:摘要研究随机实验因果零假设检验对结局误分类的敏感性。

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关注这篇论文的作者
Siyu Heng
Pamela A. Shaw

利用整数规划分析随机化检验对二元结局误分类的敏感性

研究问题
随机实验的二元结局存在误分类时,测量准确率下降到何种程度可能改变基于观测结局得到的随机化检验结论?
方法与思路
作者提出无模型的有限总体敏感性分析,以可能改变检验结论的准确率阈值为核心,并按随机化设计改写整数规划。
材料陈述的贡献
摘要称该阈值及相关概念可在不增加额外假设的情况下辅助敏感性分析,并提供大样本计算方法、试验应用和 R 包。
阅读关注点
应核对警示准确率的精确定义、允许的误分类配置、显著性判定规则,以及整数规划如何随随机化设计调整和求解。
阅读边界
所据为 arXiv 预印本,同行评审或期刊接收未核实;摘要未说明计算复杂度、阈值结果及 R 包的具体功能和实现细节。

原文摘要

Conducting a randomization test is a common method for testing causal null hypotheses in randomized experiments. The popularity of randomization tests is largely because their statistical validity only depends on the randomization design, and no distributional or modeling assumption on the outcome variable is needed. However, randomization tests may still suffer from other sources of bias, among which outcome misclassification is a significant one. We propose a model-free and finite-population sensitivity analysis approach for binary outcome misclassification in randomization tests. A central quantity in our framework is ``warning accuracy," defined as the threshold such that a randomization test result based on the measured outcomes may differ from that based on the true outcomes if the outcome measurement accuracy did not surpass that threshold. We show how learning the warning accuracy and related concepts can amplify analyses of randomization tests subject to outcome misclassification without adding additional assumptions. We show that the warning accuracy can be computed efficiently for large data sets by adaptively reformulating a large-scale integer program with respect to the randomization design. We apply the proposed approach to the Prostate Cancer Prevention Trial (PCPT). We also developed an open-source R package for implementation of our approach.

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