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Difference-in-Differences Talk at the University of Iowa

These are the materials for my Difference-in-Differences workshop at the University of Iowa, March 11, 2026.

Introduction to Difference-in-Differences

[Slides]

[Code]

Minimum Wage Data

This is the main data used during the workshop.

• Full Data: mw_data_ch2.RData   mw_data_ch2.dta

• Main subset of data used in workshop data2.RData   data2.dta

• Alternative subset of data mentioned in workshop data3.RData   data3.dta

Additional Materials

The main resources for the material from today’s workshop are

• My paper ``Difference-in-Differences: A Practitioner’s Guide’’, forthcoming at the Journal of Economic Literature

• My DiD chapter in the Handbook of Labor, Human Resources, and Population Economics. The published (gated) version is available here. The (ungated) draft version is available here.

The material for today’s workshop is a subset of the material that I taught at the Bank of Portugal earlier in Fall 2024. If you are interested, the full set of materials for that course are available here.