跳到正文
← 返回论文列表与筛选
阅读说明

本页整理公开书目信息,不生成学术质量评分。AI 解读根据题名及所注明的摘要或原文片段生成,未完成全文核验,可能有误;具体假设、证明与结论请核对原文。摘要保留来源文本,未经模型改写。

DOI 首次登记不等于接收或发表日期。部分更正、评论等条目没有独立摘要;缺少可靠材料时保留待补状态。

引用量采用 OpenAlex 单条关联记录,不合计多个记录;关联记录可能包含正式发表版本,不等于此版本单独引用。缺失不视为零,引用指标不代表论文质量。

关注作者按书目中的完整姓名匹配,同名和姓名变体需人工辨别。相关论文先按共享细分方向和具体方法排列,再参考通用方法与发表日期。

分类依据与纠错

AI 根据所提供的论文材料归类:摘要直接讨论观察性处理效应、协变量平衡、匹配及双重差分的识别限制。

反馈分类问题

正在核对关联版本…

代码、数据与补充材料

正在核对对应版本的资源…

关注这篇论文的作者

观察性研究中的效应混杂

研究问题
当某些协变量组合完全预测处理分配时,为何组间对比可以平衡低阶关系却无法平衡高阶关系,这如何限制处理效应解释?
方法与思路
作者将部分因子实验中的效应混杂思想扩展至观察性研究,建立理论,并提出匹配方法,从观察数据构造平衡的混杂因子设计。
材料陈述的贡献
摘要称,文章给出观察性效应混杂理论和新匹配方法,并以一个研究实例展示其混杂结构相较常规双重差分更具稳健性。
阅读关注点
应核对哪些处理效应与协变量交互无法区分、匹配所平衡的阶次,以及实例中稳健性的定义和与双重差分比较的依据。
阅读边界
来源为版本未注明的 OpenAlex 索引摘要;未说明完整识别条件或实例结果,不能把特定混杂结构的稳健性理解为普遍优于双重差分。

原文摘要

In experimental design, aliasing of effects occurs in fractional factorial experiments, where certain low order factorial effects are indistinguishable from certain high order interactions: low order contrast weights may be orthogonal to one another, while their higher order interactions are aliased and not identified. In observational studies, aliasing occurs when certain combinations of covariates—for example, time period and various eligibility criteria for treatment—perfectly predict the treatment that an individual will receive, so a covariate combination is aliased with a particular treatment. In this situation, when a contrast among several groups is used to estimate a treatment effect, collections of individuals defined by contrast weights may be balanced with respect to summaries of low-order interactions between covariates and treatments, but necessarily not balanced with respect high-order interactions. We develop a theory of aliasing in observational studies, illustrate that theory in an observational study whose aliasing is more robust than conventional difference-in-differences, and develop a new form of matching to construct balanced confounded factorial designs from observational data. Supplementary materials for this article are available online, including a standardized description of the materials available for reproducing the work.

笔记与分组
相关领域论文