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Guido Imbens

@imbens.bsky.social
401 followers 2 following 25 posts
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Guido Imbens @imbens.bsky.social · 03/08/2026
In IM we made a distinction between the estimand (what you are interested in estimating, often a scalar or vector), and the identified set (which may be a set). For inference we want a confidence set to cover the estimand with preset prob. You dont need to cover the identified set with preset prob.
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Guido Imbens @imbens.bsky.social · 22/07/2026
Thanks! It’s a paper I am very pleased with, I think it has some worthwhile insights. Guido
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Guido Imbens @imbens.bsky.social · 20/06/2026
Just don’t do it!
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Guido Imbens @imbens.bsky.social · 05/05/2026
Thanks! Glad you appreciate it. It has been a really fun course to teach!
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Guido Imbens @imbens.bsky.social · 21/03/2026
Don’t Do Difference In Differences (DDDID), cheers, guido
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Guido Imbens @imbens.bsky.social · 21/03/2026
Glad to hear!
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Guido Imbens @imbens.bsky.social · 10/03/2026
Impressive!
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Guido Imbens @imbens.bsky.social · 19/02/2026
In economics at least part of the credit goes to posing the question and convincing the field that the question is interesting. In other fields people often work on questions posed by others. (3/3)
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Guido Imbens @imbens.bsky.social · 19/02/2026
You can choose to work on such questions and if you solve them the field will recognize that and you will get credit for that. That is not true in economics. We do not have well-defined questions that have been puzzling the profession for many years and that will eventually get solved. (2/3)
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Guido Imbens @imbens.bsky.social · 19/02/2026
When I orginally said this in some interview, I was not intending to say anything deep (and did not know they would put this on a kitchen magnet). I do think it is interesting to reflect on the fact that in some fields there are well-defined questions that the field agrees on are important. (1/3)
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Guido Imbens @imbens.bsky.social · 03/12/2025
True story! And we got the laundry done too!
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Guido Imbens @imbens.bsky.social · 01/12/2025
Yeah, but in settings where Bernstein-von Mises does not apply, you have to declare your allegiance. E.g., unit root settings, weak instruments. And no, I did not put it on the exam, though probably should have!
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Guido Imbens @imbens.bsky.social · 01/12/2025
Years ago I would tell my first year econometrics class that there were doing ways of doing statistical inference, Bayesian and frequentist, also known as right and wrong. A student asked if that would be on the exam.
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Guido Imbens @imbens.bsky.social · 17/11/2025
Nice!
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Guido Imbens @imbens.bsky.social · 07/11/2025
Not just me. An Imbens and Yiqing Xu retrospective!
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Guido Imbens @imbens.bsky.social · 04/11/2025
I am not a big fan of DID in general, but the setting where it is used, panel data, with a binary intervention, with possibly variation in the adoption date (staggered adoption), is very common. That module, which also covered synthetic control and related methods, was very popular.
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Guido Imbens @imbens.bsky.social · 04/11/2025
Paul, check slide 25 from lecture 2.
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Guido Imbens @imbens.bsky.social · 19/10/2025
Here you go.
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Guido Imbens @imbens.bsky.social · 17/10/2025
Real
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Guido Imbens @imbens.bsky.social · 17/10/2025
Quarterly journal of economics, 2023, coauthored with Alberto Abadie, Susan Athey, and Jeff Wooldridge. One of my favorite papers over my career.
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Guido Imbens @imbens.bsky.social · 25/02/2025
It's been a pleasure working with this committee and thinking about the publication process and how things have changed or not changed, and how it can be improved.
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Guido Imbens @imbens.bsky.social · 19/12/2024
My pleasure!
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Guido Imbens @imbens.bsky.social · 24/11/2024
Yes, under the null of no effect (no direct effect and no spillovers), randomization inference allows for calculation of exact Fisher-style p-values. You can approximate those using robust (non-clustered) standard errors.
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Guido Imbens @imbens.bsky.social · 23/11/2024
Not testable.
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Guido Imbens @imbens.bsky.social · 12/11/2024
I am not sure I see that as bias.
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