论文标题
在磨损存在下重新访问匹配对和分层实验的分析
Revisiting the Analysis of Matched-Pair and Stratified Experiments in the Presence of Attrition
论文作者
论文摘要
在本文中，我们重新审查了有关在损耗存在下对匹配的对和分层实验设计的分析的一些共同建议。我们的主要目的是阐明许多关于在分析匹配配对设计时将对与一个引人入胜的单元掉落的实践的众所周知的主张。关于掉落对是有益还是有害的文献中出现了矛盾的建议，建议将较大的群体分为较大的群体作为解决问题的解决方案。为了解决这些主张，我们得出了从均值对估计器获得的估计，当保留了带有归功于单位的成对的观测值以及掉落时，均在匹配的对设计中获得的估计数。我们发现有限的证据支持掉落对有助于恢复平均治疗效果的说法，但我们发现它可能有助于恢复有条件平均治疗效果的凸平均平均值。我们在研究从具有和没有地层固定效应的治疗结果的回归中获得的估计值时，报告了分层设计的类似发现。
In this paper we revisit some common recommendations regarding the analysis of matched-pair and stratified experimental designs in the presence of attrition. Our main objective is to clarify a number of well-known claims about the practice of dropping pairs with an attrited unit when analyzing matched-pair designs. Contradictory advice appears in the literature about whether or not dropping pairs is beneficial or harmful, and stratifying into larger groups has been recommended as a resolution to the issue. To address these claims, we derive the estimands obtained from the difference-in-means estimator in a matched-pair design both when the observations from pairs with an attrited unit are retained and when they are dropped. We find limited evidence to support the claims that dropping pairs helps recover the average treatment effect, but we find that it may potentially help in recovering a convex weighted average of conditional average treatment effects. We report similar findings for stratified designs when studying the estimands obtained from a regression of outcomes on treatment with and without strata fixed effects.
