Some of the topics covered in this section are from Chapters 17
and 18 in the textbook, but other parts are not in the
textbook.
The material not from the textbook primarily comes from
Callaway, Brantly. “Difference-in-Differences for Policy
Evaluation,” Handbook of Labor, Human Resources, and Population
Economics, pp.1–61, 2023. [Link]
This section discusses (i) traditional panel data estimation
strategies, (ii) their usefulness in the context of causal effects,
(iii) and alternative approaches to using panel data to learn about
causal effects that are more robust to treatment effect
heterogeneity.