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AI 根据所提供的论文材料归类:摘要直接研究随机试验与存在未测量混杂的观测数据如何共同估计处理效应。

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关注这篇论文的作者
Shuxiao Chen
Bo Zhang
Ting Ye

整合实验与观测数据的极小极大收敛率和自适应性

研究问题
在观测数据可能含有未知混杂偏差时,将其加入随机试验分析能获得多大效率增益,估计与置信区间能否同时自适应?
方法与思路
作者从极小极大角度研究均方误差和置信区间长度,提出自适应锚定阈值估计量,并以模拟及 RCT DUPLICATE 实例辅助考察。
材料陈述的贡献
摘要称,估计量可在多重对数因子范围内达到最优率;但置信区间对未知混杂偏差的自适应一般不可能,揭示了估计与推断的差异。
阅读关注点
应核对混杂偏差的参数化、数据源之间的关系、极小极大参数空间,以及阈值规则、覆盖要求和自适应不可能性结论的范围。
阅读边界
所给版本为 arXiv 预印本,同行评审与期刊接收未核实;摘要未给出完整收敛率公式和模型条件,不能据此断言整合数据总能改善推断。

原文摘要

Randomized controlled trials (RCTs) are the gold standard for evaluating the causal effect of a treatment; however, they often have limited sample sizes and sometimes poor generalizability. On the other hand, non-randomized, observational data derived from large administrative databases have massive sample sizes and better generalizability, but they are prone to unmeasured confounding bias. It is thus of considerable interest to reconcile effect estimates obtained from randomized controlled trials and observational studies investigating the same intervention, potentially harvesting the best from both realms. In this paper, we theoretically characterize the potential efficiency gain of integrating observational data into the RCT-based analysis from a minimax point of view. For estimation, we derive the minimax rate of convergence for the mean squared error, and propose a fully adaptive anchored thresholding estimator that attains the optimal rate up to poly-log factors. For inference, we characterize the minimax rate for the length of confidence intervals and show that adaptation (to unknown confounding bias) is in general impossible. A curious phenomenon thus emerges: for estimation, the efficiency gain from data integration can be achieved without prior knowledge on the magnitude of the confounding bias; for inference, the same task becomes information-theoretically impossible in general. We corroborate our theoretical findings using simulations and a real data example from the RCT DUPLICATE initiative [Franklin et al., 2021b].

笔记与分组