Clean Hands, Clear Conclusions: Ignaz Semmelweis as a Pioneer of Causal Inference

My next series is a few things at once. It’s a reminder that sometimes people will do everything in their power to present evidence supporting scientific facts, be unpersuasive and be sent to a mental hospital by their best friend where they spend the next two weeks being beaten by guards mercilessly and then die. But it’s also a discussion of difference-in-differences, and perhaps the challenges of estimation if you’re not entirely clear what the treatment is. And the last thing is just a puzzle I wanted to share in the context of trying to make a broader point about precisely what is implied by the identification elements of a traditional difference-in-differences design.

An excellent introduction to Ignaz Semmelweis, a pioneer in causal inference and medicine, by Scott Cunningham.