Identification-robust inference for the LATE with high-dimensional covariates
高维协变量下局部平均处理效应的识别稳健推断AI 解读 ↓
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高维协变量下局部平均处理效应的识别稳健推断AI 解读 ↓
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This paper presents an inference method for the local average treatment effect (LATE) in the presence of high-dimensional covariates, regardless of the strength of identification. We propose an orthogonalized Anderson-Rubin test statistic that maintains uniformly valid asymptotic size. We provide an easy-to-implement algorithm for inferring the high-dimensional LATE by inverting our test statistic and employing the double/debiased machine learning method. Simulation results show that our test achieves better size control under both weak identification and high dimensionality, outperforming conventional alternatives. Applying the proposed method to railroad and population data to study the effect of railroad access on urban population growth, we observe wider confidence intervals than those obtained using conventional methods.