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1. pretest — Stata package implementing Mikhaeil & Harshaw (2025): pre-test for parallel-trends violations, conditional extrapolation decision rule, and bias-adjusted confidence intervals for DID.

   Stata 4 3

2. Python implementation of Lee & Wooldridge (2026) DID estimator for small samples

   Python 1

3. Stata implementation of the EquiTrends R package (TiesBos/EquiTrends). Equivalence tests for pre-trends in Difference-in-Differences estimation based on Dette & Schumann (2024, JBES). Includes maxe…

   Stata 3 1

4. Stata implementation of Double Difference-in-Differences (Egami & Yamauchi, 2023). Optimally combines standard DID and sequential DID via GMM for improved efficiency and robustness. Supports stagge…

   Stata 1