PhD in Economics, École d'économie de Paris (PSE) | Academic interest in public policies & development | Métrica & evaluación | Paris
Joined April 2011
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Hector Moreno retweeted
New working paper: "Do Modern Difference-in-Differences Estimators Change Published Findings in Business Research?"
Peter Hull's recent meta-analysis found that in economics, two-way fixed effects and heterogeneity-robust DiD estimators rarely disagree. Using Claude, I ran his protocol on seven business journals, screening 1,829 papers, and re-estimated every eligible design in Management Science and Marketing Science, the two with public replication archives. That gave 355 published staggered-adoption specifications from 40 papers, re-estimated with Callaway-Sant'Anna (CS) and Borusyak-Jaravel-Spiess (BJS). On the comparisons that pass Hull's leverage screen, from 28 (CS) and 29 (BJS) papers:
- Correlations between TWFE and modern estimates are 0.61 and 0.70, against 0.88 and 0.93 in economics.
- Estimates change sign in 25 and 18 percent of comparisons, and 10 and 7 percent show a statistically significant difference.
- Modern standard errors are 1.6 and 1.3 times those of TWFE.
- Disagreement concentrates in unbalanced panels and in designs without never-treated units.
Every table and figure rebuilds from the public repository; re-estimating a specification from scratch requires the journal's replication package.
Paper: lnkd.in/gXmtvfBC
Code, protocol, and estimates: lnkd.in/gZijx_dy
Hector Moreno retweeted
How different are two-way fixed effects from modern difference-in-differences estimations? An AI-assisted review of 1,147 staggered adoption specifications finds estimates are highly correlated and sign flips are rare, from @instrumenthull nber.org/papers/w35974
Hector Moreno retweeted
Review of Economic Studies is happy to announce the launch of the new journal, Review of Economic Studies: Insights. This is an open-access, general-interest economics journal that will publish short papers with a fast review process and accept/reject decisions.
1/4
Hector Moreno retweeted
A woman held a sign saying ‘I support genocide’ at a London protest against the proscription of Palestine Action, without appearing to face arrest.
That’s because holding a sign expressing support for genocide is not, in itself, grounds for arrest under UK law.
Hector Moreno retweeted
Not sure which difference-in-differences estimator fits your study?
Clément de Chaisemartin's team made a free guide that asks a few questions and points you to the right methods.
Tool: credible-answers.github.io/W…
Subscribe: assistweekly.org
Hector Moreno retweeted
France’s 35-hour workweek didn’t generate work-sharing: absent tax cuts, employment would have fallen 3.8%, concentrated among lower-skill workers. TFP rose 2%, output fell 1%, from @PaulineCarry, @cmontialoux, @ElioNimier, Alexandra Roulet, and @ninaroussille nber.org/papers/w35917
Hector Moreno retweeted
"Crisis in the Middle East"? This is how EU institutions call the Israel-US aggression on Iran, Israel's full-on destruction of southern Lebanon and Israel's genocidal aggression against the Palestinian people?
EU citizens deserve better than lies, hypocrisy and war-mongering.
Hector Moreno retweeted
How Different are Different Differences-in-Differences? A Large-Scale Meta-Analysis
Peter Hull
arxiv.org/abs/2610.39995 [𝚎𝚌𝚘𝚗.𝙴𝙼]
ALT I use AI-assisted replication to assess the empirical importance of negative weights in two-way fixed effects (TWFE) estimation, drawing on 1,346 staggered-adoption specifications from 108 economics papers. TWFE estimates are highly correlated with estimates from modern difference-in-differences methods, with observed sign reversals in 10.8-14.5% of comparisons and greater precision for TWFE. Hierarchical models that account for estimation noise imply a 91-98% correlation between estimands and a 0.6-2.1% probability of obtaining a statistically significant TWFE estimate with the opposite sign from the modern estimand. These findings suggest negative weights may be a less serious problem in practice, and illustrate how AI can support large-scale empirical assessments of new econometric methods.
Hector Moreno retweeted
The most immoral army
will continue to slaughter innocent people
No matter which fugitive or potential war criminal leads Apartheid Israel.
They will.
Until or Unless WE THE PEOLE force it to stop.
Stop the Genocide now.
Together we can and we will.
Hector Moreno retweeted
Hello @elonmusk and @tylercowen ,
You have just decided to publicly attack our research, six days before the vote on the California billionaire wealth tax.
Your attempt to discredit our work and that of our numerous academic colleagues is pathetic.
Let’s take a look. 🧵
Hector Moreno retweeted
When covariates are required for IV validity, usual IV may be misspecified and yield negative weights; interacted IV is often preferable.
New paper by @TymonSloczynski
restud.com/when-should-we-no…
#REStud
#EconX
#EconTwitter
Hector Moreno retweeted
How different are different differences-in-differences? The answer may (or may not) surprise you
New working paper, building on a dumb tweet from earlier this month xitter.gq/instrumenthull/status/…
A short summary follow:
Hector Moreno retweeted
👉 La “mexicanización” de Francia es… saber que México tiene una Presidenta: Claudia Sheinbaum, científica y mujer de izquierda
👉 La “mexicanización” de Francia es… descubrir que el náhuatl es una lengua viva
👉 La “mexicanización” de Francia es… "saber que los mayas escribían su historia mucho antes de nuestro encuentro"
Circula en Francia después de que Marine Le Pen declaró durante el arranque de su campaña presidencial en Francia, que no permitirá caer en la "mexicanización" debido a la presencia de cárteles del narcotráfico
Hector Moreno retweeted
Do you have a multivalued treatment or groups that switch in and out of treatment?
Fit your DID model with the new 𝘅𝘁𝘀𝘄𝗶𝘁𝗰𝗵𝗱𝗶𝗱 command in StataNow.
Learn more: stata.com/statanow/DID-with-…
Hector Moreno retweeted
I’m deeply alarmed by Israeli actions in the occupied West Bank.
Settlements are expanding, evictions are unrelenting with Palestinians driven from their lands, settler violence is surging, Palestinian families are being assaulted.
We are seeing an increasingly coercive environment, with the spectre of ethnic cleansing looming ever larger.
This must end.
There can be no durable peace in the Middle East without the realization of the legitimate rights of the Palestinian people to self-determination.
Hector Moreno retweeted
The Palestinian people continue to endure immense suffering.
Israeli restrictions on humanitarian assistance must be lifted.
The obstacles to implementation of the Comprehensive Plan to End the Gaza Conflict endorsed by the Security Council must be removed.
Civilians must be protected.
And international law must be respected.
The two-State solution remains the only viable path: Israel & Palestine living side-by-side in peace & security.
Hector Moreno retweeted
I can't stop thinking of how Apartheid Israel has killed Palestinian media workers (~300) and their relatives (700+), making Gaza the deadliest place for journalists EVER.
Time to make sure the genocidaires and their cheerleaders are held to account.
Hector Moreno retweeted
¿Estamos ahorrando lo suficiente para la jubilación en sociedades que envejecen?
Participa en el lanzamiento en línea de las nuevas Perspectivas de la #OCDE sobre las pensiones.
📅 4 de noviembre | 14:00 (hora de París)
Inscríbete: brnw.ch/21x6F51
Hector Moreno retweeted
Two Israeli strikes hit students and security guards at the Islamic University in Gaza City, killing three people and injuring at least seven others, Al Jazeera’s Hani Mahmoud reports.
Hector Moreno retweeted
Sequías e inundaciones por El Niño pueden impactar a la economía regional, por lo que los países ya activan planes y fondos de emergencia.
¿Cómo blindar el crecimiento frente al clima? #Perspectivas2027
bit.ly/3U9kETu
