2024/05/07 by Clément de Chaisemartin, Diego Ciccia, de Chaisemartin, Clément +5 · 1 citation
Agricultural and Biological Sciences · Decision Sciences · Economics, Econometrics and Finance · #Agricultural Innovations and Practices #Economic and Environmental Valuation #Optimal Experimental Design Methods #econ.EM
paper · pdf · doi:10.48550/arxiv.2405.04465
openalex publication_date 2024/05/07 · openalex created_date 2024/05/11 · openalex updated_date 2026/07/29
We study treatment-effect estimation in two-period panels where all units are untreated initially and receive strictly positive treatment doses in the second period. With quasi-untreated units receiving doses local to zero, we show that, under parallel trends, a weighted average of potential-outcome slopes is identified by a difference-in-differences estimand using quasi-untreated units as controls, and we propose a nonparametric estimator based on regression-discontinuity methods. We then develop estimators for settings without quasi-untreated units and propose a test of the homogeneous-effect assumption underlying two-way fixed-effects regressions.