Difference-in-Differences (DiD)

A guide to Difference-in-Differences with staggered treatment --- from TWFE pitfalls through Callaway-Sant'Anna group-time ATTs, doubly robust estimation, and HonestDiD sensitivity analysis --- applied to minimum wage effects on teen employment.

Assess how robust difference-in-differences results are to violations of parallel trends using the honestdid package in Stata, progressing from a simple 2x2 DiD to multi-period event studies with relative magnitudes and smoothness restrictions

Evaluate the causal effect of a cash transfer program on household consumption using regression adjustment, inverse probability weighting, doubly robust, and difference-in-differences methods in Stata

Estimating causal treatment effects using Difference-in-Differences with the diff-diff package, from the classic 2x2 design through staggered adoption with Callaway-Sant'Anna and HonestDiD sensitivity analysis

An introduction to heterogeneous treatment effects using the two-stage DID estimator of Gardner (2021)

An introduction to difference in differences with multiple time periods and staggered treatment adoption.

An introduction to difference in differences with multiple time periods and staggered treatment adoption.

An introduction to the basic differences in differences method using the classical incenerator example of Kiel and McClain (1995)