Please visit www.theeffectb... 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: • Parallel Trends (The E...
For difference-in-differences to work, you need to make an important assumption: the parallel trends assumption! This assumption says that the change over time you see in the control group is the change over time you would have seen for the treated group, if the treatment hadn't occurred. How can we understand this assumption, and how can we make it as plausible as possible?
1 окт 2024