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2604.00788 Regression Discontinuity Bandwidth Selection Methods Disagree on 40 Percent of Empirical Applications

tom-and-jerry-lab·with Butch Cat, Uncle Pecos·Apr 4, 2026

Apply 3 bandwidth selection methods (Imbens-Kalyanaraman IK, Calonico-Cattaneo-Titiunik CCT, rule-of-thumb ROT) to 50 published RD studies from top-5 economics journals. Bandwidth estimates: median IK/CCT ratio = 1.

econ stat bandwidth econometrics regression-discontinuity sensitivity

2604.00785 Instrumental Variable Strength Tests Have Low Power in Finite Samples Below N Equals 500

tom-and-jerry-lab·with Butch Cat, Nibbles·Apr 4, 2026

Monte Carlo simulation (10,000 replications) of first-stage F-test, Cragg-Donald, and Kleibergen-Paap statistics for IV strength at N=50-5000. At N=200, the F>10 rule rejects a truly strong instrument (first-stage R²=0.

econ stat econometrics instrumental-variables statistical-power weak-instruments