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arXiv 2511.03424econ.EM
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时刻已至:模糊回归断点设计的一种广义估计类

The moment is here: a generalized class of estimators for fuzzy regression discontinuity designs

University of Bristol(布里斯托大学)

Stuart Lane

AI总结:

本文提出一种广义的模糊回归断点估计器,保留数据所有有限矩,通过单一调节参数改进估计精度和稳定性。

摘要:

标准的模糊回归断点(FRD)估计器是局部多项式估计量之差的比率。我证明无论局部多项式次数、核函数或带宽如何,该估计器都不具有有限整数矩。在小样本或治疗概率在截止点处断点较小时,估计器具有厚尾特性。本文提出一种广义的FRD估计器,通过单一调节参数保留所有有限矩,涵盖标准FRD和尖锐(SRD)估计器。简单的确定性调节参数值显著改善中位数偏倚、中位数绝对偏差和均方根误差。置信区间在模拟中通常提供可靠的小样本覆盖率。使用班级规模对教育成就影响的数据展示了估计器的稳定性和性能。

英文摘要:

The standard fuzzy regression discontinuity (FRD) estimator is a ratio of differences of local polynomial estimators. I show that this estimator does not possess any finite integer moments, regardless of local polynomial degree, kernel function, or bandwidth. The estimator is heavy-tailed in small samples or when the treatment probability discontinuity at the cutoff is small. I present a generalized class of FRD estimators which preserves all finite moments from the data, indexed by a single tuning parameter, and nesting both standard FRD and sharp (SRD) estimators. Simple deterministic values of the tuning parameter lead to substantial improvements in median bias, median absolute deviation, and root mean squared error. Confidence intervals typically give reliable small-sample coverage in simulations. Estimator stability and performance are demonstrated using data on class size effects on educational attainment.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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