Clément de Chaisemartin
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cdechaisemartin.bsky.social
Clément de Chaisemartin
@cdechaisemartin.bsky.social
6K followers 880 following 120 posts
Professor @sciencespo @ScPoEcon #econometrics #education
https://sites.google.com/site/clementdechaisemartin/
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cdechaisemartin.bsky.social
Clément de Chaisemartin @cdechaisemartin.bsky.social · Jan 16
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.
cdechaisemartin.bsky.social
🧵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....
Credible Answers to Hard Questions: Differences-in-Differences for Natural Experiments
<div> The purpose of this book is to introduce applied researchers to </div> <div> modern Differences-in-Differences (DID) estimators, tailored to potentially
papers.ssrn.com
June 25, 2025 at 6:49 AM
cdechaisemartin.bsky.social
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...
« Les outils d’évaluation sont sous-utilisés par ceux qui les financent, à savoir les Etats »
TRIBUNE. L’évaluation d’impact, qui permet par exemple de tester l’efficacité des politiques publiques, est massivement captée par les géants du numérique, alors que ces outils sont souvent créés par ...
www.lemonde.fr
June 23, 2025 at 4:56 PM
Reposted by Clément de Chaisemartin
randybesco.bsky.social
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?
June 3, 2025 at 12:59 PM
cdechaisemartin.bsky.social
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....
2025 Africa Summer School - The Econometric Society
We are happy to announce that the 2025 Africa Summer School will take place in Abidjan,...
www.econometricsociety.org
May 21, 2025 at 2:12 PM
Reposted by Clément de Chaisemartin
carlislerainey.bsky.social
new preprint

"On the Foundations of the Design-Based Approach"

from Aronow, Jang, and Offer-Westort

May 21, 2025 at 11:57 AM
Reposted by Clément de Chaisemartin
cannoncloud.bsky.social
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...
TWFE Event_study plot showing sign reversal
May 7, 2025 at 3:00 PM
cdechaisemartin.bsky.social
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!
May 9, 2025 at 1:44 PM
cdechaisemartin.bsky.social
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....
Credible Answers to Hard Questions: Differences-in-Differences for Natural Experiments
This book introduces applied researchers to modern Differences-in-Differences (DID) methods, that they can use to obtain credible answers to hard causal inferen
papers.ssrn.com
April 18, 2025 at 2:28 PM
Reposted by Clément de Chaisemartin
jamesbland.bsky.social
🚩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
April 18, 2025 at 1:41 PM
Reposted by Clément de Chaisemartin
liser.lu
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
Prof. Clément de Chaisemartin Andrea Albanese
April 2, 2025 at 7:29 AM
Reposted by Clément de Chaisemartin
liser.lu
🏁 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
April 2, 2025 at 12:48 PM
cdechaisemartin.bsky.social
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
Research Assistant ERC REALLYCREDIBLE
Clément de Chaisemartin is looking for research assistants, for 12 months contracts, starting in June/July or early September 2025.
euraxess.ec.europa.eu
April 1, 2025 at 1:41 PM
Reposted by Clément de Chaisemartin
andreaecon.bsky.social
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
testing
LISER's public research focuses on social and economic policies, including their spatial dimension. Its mission is to provide the scientific community and society with clear, relevant and solid answer...
www.liser.lu
March 31, 2025 at 8:03 AM
Reposted by Clément de Chaisemartin
liser.lu
👋 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
April 1, 2025 at 7:52 AM
Reposted by Clément de Chaisemartin
andreaecon.bsky.social
📘 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
March 28, 2025 at 9:46 AM
Reposted by Clément de Chaisemartin
andreaecon.bsky.social
📢 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
March 25, 2025 at 6:59 AM
Reposted by Clément de Chaisemartin
liser.lu
⭐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
Difference-in-Differences
LISER's public research focuses on social and economic policies, including their spatial dimension. Its mission is to provide the scientific community and society with clear, relevant and solid answer...
www.liser.lu
March 25, 2025 at 9:45 AM
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.
Credible Answers to Hard Questions: Differences-in-Differences for Natural Experiments
This book introduces applied researchers to modern Differences-in-Differences (DID) methods, that they can use to obtain credible answers to hard causal inferen
papers.ssrn.com
March 12, 2025 at 3:09 PM
cdechaisemartin.bsky.social
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.
cdechaisemartin.bsky.social Clément de Chaisemartin @cdechaisemartin.bsky.social · Feb 13
@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.
March 3, 2025 at 9:30 AM
Reposted by Clément de Chaisemartin
adegendre.bsky.social
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...
www.econometricsociety.org
February 26, 2025 at 5:53 AM
Reposted by Clément de Chaisemartin
pengzell.bsky.social
Wild stuff. How come no one thought of this
C. Recommendations on Policies with Limited Returns to Harmonization • Recommendation C1: Not revealing author identities to reviewers We recommend that journals consider instituting a practice by which they avoid revealing author identities to reviewers. Under this practice, journals would ask authors to submit a version of the manuscript that does not reveal their identities and would share this version with the reviewers. Journals would also ask the reviewers to refrain from looking up author identities and not rely on these identities if they know them.
February 26, 2025 at 6:10 AM
Reposted by Clément de Chaisemartin
gabriellepepin.bsky.social
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
2026 LERA@ASSA Call for Proposals
www.leraweb.org
February 26, 2025 at 12:21 AM
Reposted by Clément de Chaisemartin
kevinhorourke.bsky.social
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
GitHub - arpie71/interwar: Interwar Trade data
Interwar Trade data. Contribute to arpie71/interwar development by creating an account on GitHub.
github.com
February 26, 2025 at 10:35 AM
Reposted by Clément de Chaisemartin
heimarthur.bsky.social
Ok. You guys just did the theory I desperately needed.
cdechaisemartin.bsky.social Clément de Chaisemartin @cdechaisemartin.bsky.social · Feb 13
@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.
February 14, 2025 at 1:44 AM
cdechaisemartin.bsky.social
@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.
February 13, 2025 at 11:53 AM