The PCDID Approach to Treatment Effects Estimation: A Further Investigation
处理效应估计的 PCDID 方法:进一步考察AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接研究交互效应面板中的 PCDID 因子估计与平均处理效应。
处理效应估计的 PCDID 方法:进一步考察AI 解读 ↓
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ABSTRACT In the present paper, we study the so‐called “PCDID” approach to treatment effects estimation in panels with interactive effects where the factors represent trends whose effect need not be parallel across the cross‐sectional units. Our interest in this step‐wise approach originates with the observation that the interactive effects are ignored in the first step, which should not be possible without affecting subsequent steps. We confirm that the estimated second‐step factors are inconsistent in the empirically relevant scenario where the included covariates are correlated with the true factors. Interestingly enough, though, fixed effects demeaning, which is in theory unnecessary since fixed effects are special interactive effects, is shown to restore consistency of the final‐step average treatment effects estimate; however, only under special circumstances. As a general solution to the inconsistency of the estimated factors, we propose an iterated PCDID version.
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