9 - Difference-in-Differences

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In the 9th week of the Introduction to Causal Inference online course, we cover difference-in-differences. Please post questions in the YouTube comments section.

0:00 Intro
0:50 Outline
1:14 Motivation
3:15 ATT Estimand
6:02 Overview of Differences-in-Differences
13:03 Time-Invariant Unobserved Confounding
14:40 Assumptions
24:28 Proof
27:48 Problems with Difference-in-Differences
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What would the prereqs be for this course? I'm getting a bit overwhelmed by the notation and not fully following all of the algebraic manipulations using P and E etc. Incredible lecture series though and learning an absolute tonne.

JOHNSMITH-verq
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For the questions in the lecture videos, may I know where I can find the answer for them? Some of them are hard for me so it would be great if there are some materials I can check them. Thanks!

tianyili
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Amazing lectures! I am learning so much in such a quick time. Thanks!
When is your book coming out? I’d want to get my hands on that :)


The slack channel seems to be closed for now. Any other way to get invited?

RobertKwapich
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would you attach the data for exercise

mohammedhassen
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hii, can you please confirm that did estimate = att ?

jayagupta
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Hi professor I hope you are doing well is it possible to send me data like this I will try to do it in stata

fgghdfg
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Very dense material, excessive and non intuitive use of notation..one could just as well read Woodridge and a host of research papers. If the goal of the course is to teach, I'm not sure this will teach anyone anything. The effort to parse the material is too much.

babyyoda