DiD replication — original collection

22 original studies · 1,338 plotted comparisons.

The original collection is credited to Peter Hull. These 22 papers follow the selection criteria established in his twfe-replication repository, accompanying Two-Way Fixed Effects and Modern Difference-in-Differences: An Empirical Comparison. We preserve the original collection in full as the reference, with its available archived results.

Each report distinguishes source-replication checks from additional estimator comparisons. The community extension, potential refinements and provisional eligibility assessments are kept separately under Under development; they do not redefine the original collection or Peter Hull’s criteria.

Original comparisons: JSON · CSV · Membership totals · Code · Editable template

Studies

Study	Status	Report
Curriculum and Ideology	660 comparison summaries	Report
Do Powerful Politicians Really Cause Corporate Downsizing?	73 comparison summaries	Report
Reply: Do Powerful Politicians Really Cause Corporate Downsizing?	72 comparison summaries	Report
Market Integration Demand and the Growth of Firms	49 comparison summaries	Report
Do Government Audits Reduce Corruption?	21 comparison summaries	Report
Railroads of the Raj	4 comparison summaries	Report
The Arrival of Fast Internet and Employment in Africa	4 comparison summaries	Report
Copyrights and Creativity	33 comparison summaries	Report
Vertical Integration Supplier Behavior and Quality Upgrading	29 comparison summaries	Report
Leadership in Social Movements	4 comparison summaries	Report
Hall of Mirrors	4 comparison summaries	Report
The Rise and Fall of Local Elections in China	8 comparison summaries	Report
Ideology and Performance in Public Organizations	15 comparison summaries	Report
Reconciliation Narratives	28 comparison summaries	Report
Retail Pharmacies and Drug Diversion	10 comparison summaries	Report
The Gift of a Lifetime	60 comparison summaries	Report
Trading Nontradables	10 comparison summaries	Report
The Rise of Fiscal Capacity	69 comparison summaries	Report
The Real State	Comparison unavailable	Report
Credit Markets Property Rights and the Commons	9 comparison summaries	Report
Landmines and Spatial Development	16 comparison summaries	Report
Corruption as a Local Advantage	173 comparison summaries	Report

Calibration comparisons

Both axes use the matching TWFE standard error: x = TWFE / SE(TWFE), y = alternative estimate / SE(TWFE). Colors identify studies; circles denote static specifications and squares denote event-study averages. Capped points are marked at the boundary. Use the range selector or hover for actual coordinates and specification details.

BJS and Sun–Abraham use outline rings for cohort-homogeneity rejection at 5%, from the homoskedastic deviations F-test without multiplicity adjustment. Missing tests are not non-rejections. CS-DID has separate equal-event-time and treated-cell summaries. Multisynth results remain in paper reports and downloads, not separate calibration panels.