Advanced Difference-in-Differences

Two‑way fixed effects bias comparison showing 78 percent bias reduction to under 5 percent using Callaway‑Sant’Anna group‑time average treatment effects.

Econometrics

Advanced Difference-in-Differences Methods: Beyond Two-Way Fixed Effects

Advanced difference-in-differences methods correct TWFE bias of 66-79% in staggered designs. Callaway-Sant'Anna, Sun-Abraham, and Goodman-Bacon have transformed applied econometrics.

April 17, 2026