第一章

• Conventional practice
• 1.1 Basicideas and Model setup (2 time periods*2 groups)
• 1.2 Extensions
• (1) Multiple time periods or multiple groups (forinstance, the staggered DiD estimation)
• (2) Repeated Cross-Sections
• (3) Two-Dimensional Cross-Sections (for instance,Cohort DiD)
• (4) Fuzzy DiD
• (5) DDD, DDDD, …
• 1.3 Estimation and inference
• (1) Basic model specification
• (2) Two-way fixed effects linear regression specification
• a. Static TWFE model
• b. Dynamic TWFE model (Event study)

第二章

• Recent development
• 2.1 Interpretation of the TWFE estimators (with multiple time periods or multiple groups)
• 2.2 Problemsof the TWFE estimators with heterogeneous treatment effects
• 2.3 Alternative estimators
• (1) Estimators based on some “building blocks”
• a. Estimating only the instantaneous treatment effect
• b. Estimators based on group-time ATT
• c. Estimators based on cohort-specific ATT
• (2) Two-stage estimators/imputation estimators