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arXiv 2109.06150econ.EMstat.AP
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截断条件期望函数的非参数估计

Nonparametric Estimation of Truncated Conditional Expectation Functions

Tomasz Olma

摘要:

截断条件期望函数在经济学中有广泛的应用,包括收入不平等度量、金融风险管理和影响评估。它们通常涉及截断高于或低于其条件分布的某些分位数的结果变量。本文基于局部线性方法,提出了一类新的两阶段非参数估计。在该估计问题中,条件分位数函数是必须在第一阶段中估计的干扰参数。由于在第二阶段中使用了奈曼正交矩,该估计器对第一阶段的估计误差不敏感。这种构造确保了为标准非参数回归开发的推断方法可以容易地适应于对截断条件期望进行推断。作为一种扩展,估计截断分位数水平被认为是估计。建议的估计适用于两个经验设置:尖锐的断点回归设计与操纵运行变量和随机试验与样本选择。

英文摘要:

Truncated conditional expectation functions are objects of interest in a wide range of economic applications, including income inequality measurement, financial risk management, and impact evaluation. They typically involve truncating the outcome variable above or below certain quantiles of its conditional distribution. In this paper, based on local linear methods, a novel, two-stage, nonparametric estimator of such functions is proposed. In this estimation problem, the conditional quantile function is a nuisance parameter that has to be estimated in the first stage. The proposed estimator is insensitive to the first-stage estimation error owing to the use of a Neyman-orthogonal moment in the second stage. This construction ensures that inference methods developed for the standard nonparametric regression can be readily adapted to conduct inference on truncated conditional expectations. As an extension, estimation with an estimated truncation quantile level is considered. The proposed estimator is applied in two empirical settings: sharp regression discontinuity designs with a manipulated running variable and randomized experiments with sample selection.

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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