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AI 根据所提供的论文材料归类:摘要明确研究网络干扰下随机实验的处理效应估计与设计。

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关注这篇论文的作者
Qianyi Chen
Bo Li
Lu Deng
Yong Wang

网络干扰下社交网络 A/B 测试的协方差优化设计

研究问题
当社交网络中的处理产生邻居干扰时,如何设计随机分配方案,在估计全局平均处理效应时平衡偏差与方差?
方法与思路
作者在一跳干扰的潜在结果模型下推导 HT 估计量的偏差与方差,通过优化处理分配协方差来最小化均方误差上界,并用投影梯度下降实现。
材料陈述的贡献
摘要提出将未知干扰效应部分与实验设计部分分离的优化目标,并称模拟在多种设置及模型错设程度下显示方法优势。
阅读关注点
应核对一跳干扰模型和效应目标的定义、均方误差上界如何构造,以及优化所得协方差如何对应可实施的随机分配。
阅读边界
所据为 arXiv 预印本,同行评审及期刊接收未核验;摘要未给出上界条件、具体模拟结果或真实平台验证,优势范围尚不能判断。

原文摘要

Online A/B tests have become increasingly popular and important for social platforms. However, accurately estimating the global average treatment effect (GATE) has proven to be challenging due to network interference, which violates the Stable Unit Treatment Value Assumption (SUTVA) and poses a great challenge to experimental design. Existing network experimental design research was mostly based on the unbiased Horvitz-Thompson (HT) estimator with substantial data trimming to ensure unbiasedness at the price of high resultant estimation variance. In this paper, we strive to balance the bias and variance in designing randomized network experiments. Under a potential outcome model with 1-hop interference, we derive the bias and variance of the standard HT estimator and reveal their relation to the network topological structure and the covariance of the treatment assignment vector. We then propose to formulate the experimental design problem to optimize the covariance matrix of the treatment assignment vector to achieve the bias and variance balance by minimizing a well-crafted upper bound of the mean squared error (MSE) of the estimator, which allows us to decouple the unknown interference effect component and the experimental design component. An efficient projected gradient descent algorithm is presented to implement the desired randomization scheme. Finally, we carry out extensive simulation studies 2 to demonstrate the advantages of our proposed method over other existing methods in many settings, with different levels of model misspecification.

笔记与分组