I recently spoke with my editor at Yale University Press and in order for the second edition of the Mixtape, my 2021 book on causal inference, to be available for the January 2024 ASSA meetings (the annual conference for economists), I have to have a copy ready by December 9. It’s a tight deadline but I’ve been slowly creating the structure for the revision for over a year through my workshops so I’m working on it now. Let me now tell you what I’m shooting for in this revision.
Difference in differences
The most substantive update to the Mixtape is a restructuring of the diff in diff chapter. The book will progress similar to how my workshop is structured. One of the ways I’ve changed in how I think abt diff in diff is that I now largely think in terms of Andrew Goodman-Bacons “two by two” equation. So I spend more time on the front end being clearer about that. I then will have a simple example to illustrate the bias of that equation which is the non-parallel trends bias. I’ll then di…
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