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AI 根据所提供的论文材料归类:摘要围绕自适应随机实验的平均处理效应估计与推断展开,直接对应因果推断。

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关注这篇论文的作者
Daniel Molitor
Samantha Gold

自适应实验中的随时有效推断:协变量调整与功效平衡

研究问题
在多臂老虎机等自适应实验中,如何改善平均处理效应估计精度,同时缓解次优处理臂功效不足并支持持续监测?
方法与思路
作者扩展混合自适应设计,提出协变量调整估计量 MADCovar,以及向功效不足处理臂动态重分配样本的 MADMod。
材料陈述的贡献
摘要称,两种方法保留渐近置信序列推断;模拟中 MADCovar 的区间宽度最多缩减六成,MADMod 改善各臂功效。
阅读关注点
应核对无偏性与渐近置信序列的成立条件、停止规则适用范围,以及功效平衡与自适应分配效率之间的具体权衡。
阅读边界
依据 arXiv 预印本摘要,同行评审或接收未核实;所述改善限于报告场景,摘要未说明有限样本随时有效性的具体保证。

原文摘要

Adaptive experiments such as multi-armed bandits offer efficiency gains over traditional randomized experiments but pose two major challenges: invalid inference on the Average Treatment Effect (ATE) due to adaptive sampling and low statistical power for sub-optimal treatments. We address both issues by extending the Mixture Adaptive Design framework (arXiv:2311.05794). First, we propose MADCovar, a covariate-adjusted ATE estimator that is unbiased and preserves anytime-valid inference guarantees while substantially improving ATE precision. Second, we introduce MADMod, which dynamically reallocates samples to underpowered arms, enabling more balanced statistical power across treatments without sacrificing valid inference. Both methods retain MAD's core advantage of constructing asymptotic confidence sequences (CSs) that allow researchers to continuously monitor ATE estimates and stop data collection once a desired precision or significance criterion is met. Empirically, we validate both methods using simulations and real-world data. In simulations, MADCovar reduces CS width by up to 60% relative to MAD. In a large-scale political RCT with 32,000 participants, MADCovar achieves similar precision gains. MADMod improves statistical power and inferential precision across all treatment arms, particularly for suboptimal treatments. Simulations show that MADMod sharply reduces Type II error while preserving the efficiency benefits of adaptive allocation. Together, MADCovar and MADMod make adaptive experiments more practical, reliable, and efficient for applied researchers across many domains. Our proposed methods are implemented through an open-source software package.

笔记与分组
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