9.4 - Problems with Difference-in-Differences

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In this part of the Introduction to Causal Inference course, we cover some important problems with the difference-in-differences method for causal effect estimation. Please post questions in the YouTube comments section.

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could you give an intuitive example of what "time and treatment interact" means? thanks!

josephzhou
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are answers for those questions at the end of the vid available somewhere?

yesong_choe