🧵1/4 🚨 We have finalized our DID textbook! You’ve run out of excuses for sketchy pre-trends and mysterious TWFE coefficients. 📘 Credible Answers to Hard Questions: Differences-in-Differences for Natural Experiments By Chaisemartin & D’Haultfœuille. papers.ssrn.com/sol3/papers....

Pleased to share op-ed in Le Monde: "Impact Evaluation: For GAFAM or for Citizens?" 🔗 French version (Le Monde): www.lemonde.fr/idees/articl... 🔗 English translation (Sciences Po): www.sciencespo.fr/department-e... Tech companies routinely use impact evaluation tools to optimize their services...

Looking forward to presenting “Electoral Discrimination Reconsidered”, with Selen Onculoglu at #CPSA_ACSP25 The last few years have seen a) major changes in racial politics b) new null results c) methodological developments. So: do ethnic minority candidates really get less votes?

Very excited to teach, with Moussa Richard Kouamé, in the 2025 Africa Summer School of the Econometrics Society, in ENSEA Abidjan! The class will be about DIDs (what else?), following our textbook. Looking forward to it! www.econometricsociety.org/regional-act... papers.ssrn.com/sol3/papers....

new preprint "On the Foundations of the Design-Based Approach" from Aronow, Jang, and Offer-Westort

I created a shiny web tool to play around with OL/TWFE so you can teach how this stuff can get so screwy. You can mess with temporal and cohort heterogeneity, treatment timing, whether you have any controls, etc. Share your worst plots! #econsky cannoncloud.shinyapps.io/TWFE_OLS_Pla...

Happy to share videos of 12-hour course on DIDs I taught at @liser.lu in Luxemburg. Covers in depth the first 7 chapters of our textbook, and last chapter more quickly. Use it to teach yourself (for free!) recent developments on DID! Thanks ‪@andreaecon.bsky.social‬ for class and videos!

Just posted updated version of our DID textbook! We now have drafts of all chapters, including the one on general designs! Now you can tell your friends still on X that they are DID-outdated :-) Happy easter for those of you that celebrate it. papers.ssrn.com/sol3/papers....

🚩New version of a working paper now available!🚩 "Rounding the (Non)Bayesian Curve: Unraveling the Effects of Rounding Errors in Belief Updating" with Yaroslav Rosokha papers.ssrn.com/sol3/papers.... A thread 👇👇 #Bayes #TeachBE #EconSky

Day 2 of the course on Difference-in-Differences (DiD) at the Jane Jacobs Conference Room, LISER, with Prof. Clément de Chaisemartin @cdechaisemartin.bsky.social. ℹ️ Learn more: www.liser.lu/course-diffe... Organised by @andreaecon.bsky.social & Pierre Imhoff 🤝 #EconSky #Econometrics #Education

🏁 Day 2 of Prof. Clément de Chaisemartin's visit concludes with a seminar: "Difference-in-Differences Estimators of Intertemporal Treatment Effects" 🙏 Big thanks to @cdechaisemartin.bsky.social and organisers @andreaecon.bsky.social et al. ℹ️ www.liser.lu/course-diffe... #EconSky #Econometrics

Please RT: I am hiring RAs, for 12-month contracts, starting in June/July or early September 2025. Apply if you’re interested in working on some fun and useful econometrics projects! #EconSky euraxess.ec.europa.eu/jobs/331499

Last chance to register for our Difference-in-Differences course with Prof. Clément de Chaisemartin (@cdechaisemartin.bsky.social), taking place tomorrow and Wednesday – April 1st & 2nd! Join us at @liser.lu or online for this free course. Register now: www.liser.lu/fr/course-di... #EconSky

👋 A big LISER welcome to Prof. Clément de Chaisemartin (@cdechaisemartin.bsky.social) who has arrived in #Luxembourg to give a 2-day course on Difference-in-Differences (DiD). ℹ️ Learn more: www.liser.lu/course-diffe... 💪Organised by @andreaecon.bsky.social et al. #EconSky #Econometrics #Education

📘 Ready for Day 2 of our hybrid Difference-in-Differences course at @liser.lu with Prof. Clément De Chaisemartin (@cdechaisemartin.bsky.social) Still possible to join for Days 3 & 4 (April 1–2, 2025)! Free online registration is open: 👉 www.liser.lu/course-diffe... #EconSky #CausalInference

📢 Excited to kick off our 12-hour hybrid course on Difference-in-Differences today, led by Prof. Clément De Chaisemartin (@cdechaisemartin.bsky.social) at LISER. Still time to join! Free online registration open for Days 3 & 4 (April 1–2, 2025): www.liser.lu/fr/course-di.... #EconSky

⭐LISER is honoured to host a 12-hour course on Difference-in-Differences, led by Prof. Clément de Chaisemartin, starting today. ℹ️ Free registration for Days 3 and 4 is still possible! ℹ️ Learn More & Register here: www.liser.lu/course-diffe... . @andreaecon.bsky.social @cdechaisemartin.bsky.social

Slowly but surely coming along: we have a new version of our working textbook on diffs in diffs! papers.ssrn.com/sol3/papers.... Chapters 2 to 4, which cover the set up, classical DIDs, and relaxations of the parallel trends assumptions have been thoroughly revised and are now almost finished.

We have a 4th Stata package, multisit_regLATE, to estimate sign of reg coefficients of sites' LATEs on characteristics. For instance, can be used to test if LATEs positively correlated to sites' first stages (consistent w Roy model). ssc install multisite, then run it once to install 4 packages.

Today some of the leading economists released a report on how to improve the publication and peer review process in our profession. It is great! www.econometricsociety.org/uploads/docu...

Wild stuff. How come no one thought of this

Do you work on topics related to employment and labor relations? Submit an individual paper or panel to LERA@ASSA 2026! LERA will be sponsoring a number of sessions, and they usually are well-attended. Submission deadline 3/15. #EconSky #EconConf

Raymond Hicks (@arpie71.bsky.social) has just posted a vast amount of "raw" interwar trade data; it is available at github.com/arpie71/inte... #econhist

Ok. You guys just did the theory I desperately needed.

@Antoinedeeb.bsky.social and I have new paper and Stata commands, to estimate & predict treatment-effect heterogeneity in multi-site RCTs! papers.ssrn.com/sol3/papers.... Estimators computed by multisite_varITT multisite_regITT and multisite_varLATE Stata packages, available from SSC.

I have a project where one of @cdechaisemartin.bsky.social 's papers is relevant. He has slides posted which were very helpful in understanding what is going on etc. I like this convention and hope others adopt it. Not sure what is says about me that i find slides easier to digest than a paper...

I teach a course where students pick a construct and develop a questionnaire. Last year, a group chose "precrastination." They were the 1st to hand in their assignment. This year, a group chose "dysfunctional conscientiousness." I just received their final report, >1 week before the deadline 😭

Homelessness can be eliminated! Finland shows how. “Housing first”, in an approach integrated with financial assistance and targeted support, works! https://oecdecoscope.blog/2021/12/13/finlands-zero-homeless-strategy-lessons-from-a-success-story/ /ht @brenttoderian.bsky.social

Our political economy of field experiments study has just been released by the @nberpubs.bsky.social! Written with @gubri.bsky.social, who is brilliant and on the market this year!

Inflation doesn’t just hurt wallets—it shifts votes. New research by Jonathan Federle, @cathrinmohr.bsky.social, and @schularick.bsky.social finds that "inflation surprises" boost support for extremist, populist parties. Let’s unpack these findings. 🧵 #EconSky @kielinstitute.bsky.social 1/10

🌍🌎🌏 Geoeconomics is emerging as a major research field. @cathrinmohr.bsky.social & Christoph Trebesch reviewed the literature: What is Geoeconomics? Key questions and findings? What research is needed? Read the full survey here 👉 www.ifw-kiel.de/publications...

i always assumed kinda vaguely that farming must have been so attractive that it lead to sedentary life, but actually it turns out it's sedentary life (and the attendant possibilities of storage) that are so attractive that you end up inventing farming to support it academic.oup.com/qje/article-...

Ambitious and important JMP from Ruchi Mahadeshwar (with Alex Zhou) at Brown. They use experimental variation and a structural model to show that 1) on margin, disutility from sex work is *16* times that of non-sex work and 2) labor supply of sex work is v. elastic. drive.google.com/file/d/15oXa...

✨ Cheers to 2025! ✨ Here’s to a year where: ✅ Everyone who wants a job can find one. 📈 Paychecks grow for workers across the board. ⬆️ Minimum wages rise to match the hard work people put in. Let’s make it happen. 🎉

Under staggered treatment, a distributed lag TWFE is garbage even without heterogenous treatment effect. It cannot provide a reliable assessment of pre-trends given the wacky weights (possibly negative) it puts on the underlying (cohort specific) leads AND lags. Just garbage.

As a journal editor for a few decades I find it pleasing to watch scholars mature. They eventually realize that journal refeering is not about how many papers they can knock down but how many they can lift up.

#econsky Preparing the reading list for my graduate course in #marketdesign for students to write a report. Any suggestion of recent papers in matching or auctions? (2yo max) self promotion encouraged. Any method welcome: theory, structural, empirical, experimental...etc

Are you estimating a first-difference (FD) regression, assuming that treatment changes randomly assigned? Happy to share new paper with two simple pieces of advice. papers.ssrn.com/sol3/papers.... Advice 1: start by regressing treatment change Delta D on baseline treatment D1.

Curious about Econ & Gender. Check out this session Sat 12:30pm at the Marker Hotel (location currently wrong in the #Assa2025 app) with work by @econprachi.bsky.social @bilgeerten.bsky.social and chaired by @olgashurchkov.bsky.social www.aeaweb.org/conference/2...,

Often when I’m presenting, I load my slides to my website and then access them that way. But I usually have trouble remembering the file names. Made a Ruby plugin to automatically categorize and organize the pdfs by creation date, including a thumbnail from the first slide:

This paper looks v interesting: watching more TV improved the academic performance of disadvantaged pupils - because it substituted for them doing riskier things academic.oup.com/ej/article/1...

It's February at The Economic Journal ❤️ Lots of great papers, long (9) and short (2). Enjoy! academic.oup.com/ej/issue/135...

#EconFr le premier papier issue de ma thèse a été soumis hier. Et comme c’est un papier particulièrement instructif pour la réforme du RSA, je vais faire un petit 🧵 et vous raconter ce qu’on y trouve. Dans le post suivant, vous trouverez le lien vers le papier et les codes de réplication.

It’s over 1,000km from Berlin to Paris There’s now a direct daytime train between them, that takes 8 hours and costs just €59. Leave at 10am, arrive 6pm. And… it’s just 1% the carbon emissions of the equivalent flight www.euronews.com/travel/2024/...

I think in economics we are getting to an interesting place of (relative) epistemic humility about merhods #EconSky. Theory first reigned, then the credibility revolution arrived, and some took it to extremes. And now we are back to a more balanced approach of methodological pluralism. Thoughts?

📢 **new results** LLMs and AI can be used to extract measures from text like sentiment, beliefs, and uncertainty. What can go wrong when plugging these measures into regressions and how to fix the problem? Read more below and check out arxiv.org/abs/2402.15585 for details #EconSky

Today CEPR and Sciences Po paid tribute to the late Philippe Martin. A brilliant economist and a guiding force in building and nurturing CEPR, his legacy has left an indelible mark on the world of economic research. #EconSky 📈📉

Happy to release long term effects of our boarding school RCT! The boarding school increases students’ chances of graduating from higher education by 60%, and divides high school drop out by 2. Paper: papers.ssrn.com/sol3/papers.... policy brief: sciencespo.hal.science/hal-04819301

Sciences Po has junior positions in econometrics and in health/environmental this year, please apply, and please RT! econjobmarket.org/positions/10...