Dynamic Difference-in-Differences (The Effect, Videos on Causality, Ep 55)

Please visit https://www.theeffectbook.net to read The Effect online for free, or find links to purchase a physical copy or ebook.

The Effect is a book about research design and causal inference. How can we use data to learn about the world? How can we answer questions about whether X causes Y even if we can't run a randomized experiment? The book covers these things and plenty more. These videos are meant to accompany the book, although they can also be viewed on their own.

This video relates to material found in Chapter 18 of the book.

A version of this video without background music can be found here:    • Dynamic Difference-in-Differences (Th...  

The dynamic difference-in-differences model is a neat way to allow the effect of your treatment to vary over time in a difference-in-differences context. This can allow you to see how the effect evolves after it goes into place, and also lets you see if it appears to have an effect before it even happens (uh oh... perhaps a parallel trends violation!)