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AI 根据所提供的论文材料归类:摘要明确研究潜在结果框架下的自适应随机实验设计、处理效应精度和置信区间。

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关注这篇论文的作者
Jessica Dai
Paula Gradu

Clip-OGD:序贯实验中自适应 Neyman 分配的实验设计

研究问题
在序贯随机实验中,能否仅利用逐步获得的信息调整处理分配,使估计精度接近知道全部潜在结果的最优 Neyman 设计?
方法与思路
作者在设计型潜在结果框架中定义 Neyman 比率和遗憾指标,借鉴在线优化提出 Clip-OGD,并构造保守方差估计量。
材料陈述的贡献
摘要称,忽略对数因子后的期望遗憾上界为平方根样本量阶,可渐近恢复最优 Neyman 方差,并构建渐近有效置信区间。
阅读关注点
应核对分配概率的截断规则、潜在结果及序贯设计条件、遗憾与方差效率的联系,以及保守方差估计支持的渐近推断。
阅读边界
这是 arXiv 预印本,同行评审状态未经核实。摘要未列出理论条件,渐近效率不代表有限样本中总能优于非自适应设计。

原文摘要

From clinical development of cancer therapies to investigations into partisan bias, adaptive sequential designs have become increasingly popular method for causal inference, as they offer the possibility of improved precision over their non-adaptive counterparts. However, even in simple settings (e.g. two treatments) the extent to which adaptive designs can improve precision is not sufficiently well understood. In this work, we study the problem of Adaptive Neyman Allocation in a design-based potential outcomes framework, where the experimenter seeks to construct an adaptive design which is nearly as efficient as the optimal (but infeasible) non-adaptive Neyman design, which has access to all potential outcomes. Motivated by connections to online optimization, we propose Neyman Ratio and Neyman Regret as two (equivalent) performance measures of adaptive designs for this problem. We present Clip-OGD, an adaptive design which achieves $\widetilde{O}(\sqrt{T})$ expected Neyman regret and thereby recovers the optimal Neyman variance in large samples. Finally, we construct a conservative variance estimator which facilitates the development of asymptotically valid confidence intervals. To complement our theoretical results, we conduct simulations using data from a microeconomic experiment.

笔记与分组