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分类依据与纠错

AI 根据所提供的论文材料归类:摘要明确研究网络单位间干扰下的随机实验设计与总处理效应估计,直接对应网络与干扰及因果推断。

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代码、数据与补充材料

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关注这篇论文的作者
Yiming Jiang
He Wang

利用混合随机实验进行网络干扰下的因果推断

研究问题
当网络中个体结果受到其他单位处理分配影响时,如何设计实验并估计总处理效应,同时控制偏差和估计方差?
方法与思路
作者混合独立伯努利随机化与簇随机化,构造总处理效应估计量;在网络边权未知时进一步提出不依赖边权的设计。
材料陈述的贡献
摘要称,混合设计下估计量无偏,并给出随网络度数、规模和处理概率变化的方差上下界及未知边权设计的上界。
阅读关注点
应核对网络干扰模型、总效应定义和混合随机化机制,并比较已知与未知边权时的方差阶数及上下界之间的差距。
阅读边界
这是 arXiv 预印本,同行评审及期刊接收未核实;摘要未说明完整干扰模型与界限条件,无偏性不能推广到任意网络干扰。

原文摘要

In randomized experiments, the classic Stable Unit Treatment Value Assumption (SUTVA) posits that the outcome for one experimental unit is unaffected by the treatment assignments of other units. However, this assumption is frequently violated in settings such as online marketplaces and social networks, where interference between units is common. We address the estimation of the total treatment effect in a network interference model by employing a mixed randomization design that combines two widely used experimental methods: Bernoulli randomization, where treatment is assigned independently to each unit, and cluster-based randomization, where treatment is assigned at the aggregate level. The mixed randomization design simultaneously incorporates both methods, thereby mitigating the bias present in cluster-based designs. We propose an unbiased estimator for the total treatment effect under this mixed design and show that its variance is bounded by $O(d^2 n^{-1} p^{-1} (1-p)^{-1})$, where $d$ is the maximum degree of the network, $n$ is the network size, and $p$ is the treatment probability. Additionally, we establish a lower bound of $Ω(d^{1.5} n^{-1} p^{-1} (1-p)^{-1})$ for the variance of any mixed design. Moreover, when the interference weights on the network's edges are unknown, we propose a weight-invariant design that achieves a variance bound of $O(d^3 n^{-1} p^{-1} (1-p)^{-1})$, which is aligned with the estimator introduced by Cortez-Rodriguez et al. (2023) under similar conditions.

笔记与分组
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