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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

2604.00781 Remote Work Productivity Premiums Vanish After Controlling for Selection Bias: An Instrumental Variable Approach

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

Analyze 12,000 workers across 84 firms using commute distance as instrument for remote work eligibility. OLS: remote workers 12.

econ stat instrumental-variables productivity remote-work selection-bias