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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。

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分类依据与纠错

AI 根据所提供的论文材料归类:所给摘要明确讨论工具变量、处理依从性与平均因果效应的识别。

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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
James M. Robins
Sander Greenland

利用工具变量识别因果效应:评论

研究问题
所给索引摘要讨论二元处理分配可忽略但依从不完全时,工具变量估计对象何时能够解释为某类个体的平均因果效应。
方法与思路
索引摘要描述将工具变量嵌入 Rubin 因果模型,区分分配与实际接受处理,并通过征兵抽签应用考察关键假设的敏感性。
材料陈述的贡献
索引摘要称在若干假设下,工具变量估计对象对应依从者平均因果效应;缺少这些假设时,仅具有意向处理效应比值解释。
阅读关注点
应先核对评论题名与索引摘要的对应关系,再核对因果解释所需假设、依从者定义,以及敏感性分析的实际范围。
阅读边界
题名标为评论,但索引摘要描述完整研究框架,二者对应关系需查原文;版本未注明,不能将这些内容认定为评论的独立贡献。

原文摘要

We outline a framework for causal inference in settings where assignment to a binary treatment is ignorable, but compliance with the assignment is not perfect so that the receipt of treatment is nonignorable. To address the problems associated with comparing subjects by the ignorable assignment-an intention-to-treat analysis-we make use of instrumental variables, which have long been used by economists in the context of regression models with constant treatment effects. We show that the instrumental variables (IV) estimand can be embedded within the Rubin Causal Model (RCM) and that under some simple and easily interpretable assumptions, the IV estimand is the average causal effect for a subgroup of units, the compliers. Without these assumptions, the IV estimand is simply the ratio of intention-to-treat causal estimands with no interpretation as an average causal effect. The advantages of embedding the IV approach in the RCM are that it clarifies the nature of critical assumptions needed for a causal interpretation, and moreover allows us to consider sensitivity of the results to deviations from key assumptions in a straightforward manner. We apply our analysis to estimate the effect of veteran status in the Vietnam era on mortality, using the lottery number that assigned priority for the draft as an instrument, and we use our results to investigate the sensitivity of the conclusions to critical assumptions.

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