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arXiv 1606.04086stat.APstat.ME
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具有离散运行变量的不连续回归设计的推断

Inference in Regression Discontinuity Designs with a Discrete Running Variable

Michal Kolesár, Christoph Rothe

摘要:

当运行变量只取中等数量的不同值时,我们考虑回归不连续设计中的推断。特别是,我们研究了使用基于运行变量聚类的标准误的置信区间(CI)的常见做法,以使推理对模型误设具有鲁棒性(Lee和Card,2008)。我们得出的理论结果和目前的模拟和经验证据表明,这些CI不防范模型误设,他们有穷人的覆盖率。因此,我们建议不要在实践中使用这些配置项。相反,我们提出了两个替代CI的条件期望函数的限制下,易于解释的保证覆盖性能。

英文摘要:

We consider inference in regression discontinuity designs when the running variable only takes a moderate number of distinct values. In particular, we study the common practice of using confidence intervals (CIs) based on standard errors that are clustered by the running variable as a means to make inference robust to model misspecification (Lee and Card, 2008). We derive theoretical results and present simulation and empirical evidence showing that these CIs do not guard against model misspecification, and that they have poor coverage properties. We therefore recommend against using these CIs in practice. We instead propose two alternative CIs with guaranteed coverage properties under easily interpretable restrictions on the conditional expectation function.

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