6/
We focus on model-based approaches, more common in metrics

📚 Nice citation from Haavelmo to justify this framework + marvel movies to help make the point 🕷️: )

We also discuss design-based approaches at the end

3/
Example to illustrate problem: comparison of means

Robust SEs estimate the variance of treated (controls) using only treated (controls) data

✅ Great with many treated/many controls!
↪️ Allow for ≠ distributions of treated/control errors

❗ Go bad with few treated units...

🧵New survey paper: "Inference with Few Treated Units"
Luis Alvarez, Bruno Ferman and Kaspar Wüthrich

Tired of referees saying your standard errors are wrong?

This survey will help you understand if you really have a problem — and, if so, how to fix it!