Jan Marcus
@janmarcus.de
Professor for Applied Statistics, Freie Universität Berlin; co-editor @jcre.bsky.social; education and health economist; table tennis player http://janmarcus.de
Right now, a replication can exist and still be almost invisible to someone reading the original paper. That makes it harder for researchers, reviewers, students, journalists, and policymakers to know what evidence has accumulated around a finding.
Episode 2 from our 1-day I4R workshop is out. @janmarcus.de, @josefinaw.bsky.social & René Bekkers ask: How can we link publications to replications, so anyone reading a paper can instantly see whether its findings have been retested? 🧵
Peer review is a finite resource. The Diamond Reviewer Pledge asks researchers to commit to reviewing at least one article for a diamond open-access journal in the next 12 months. forrt.org/diamond-revi...
Diamond Reviewer Pledge
Signatories of the Diamond Reviewer Pledge commit to reviewing at least one article in the next 12 months for a diamond open access journal.
forrt.org
Want to learn more about modern diff-in-diff estimators? Check out this forthcoming lecture series with Xavier D'Haultfoeuille. Registration still open!
📣 We are happy to announce the BeNA Lecture Series 2026: Recent Advances in Difference-in-Differences with Xavier D’Haultfoeuille (CREST-ENSAE). 📅 Oct 5–6, 2026 📍 @rfberlin.bsky.social
Wie haben wirtschaftliche Sorgen und Migration die Landtagswahl in Sachsen-Anhalt geprägt? Und welche Wirtschaftspolitik wäre von einer AfD-Regierung zu erwarten? Dazu ein kurzes Interview.
Nach der Landtagswahl in Sachsen-Anhalt: Max Steinhardt, Professor für Volkswirtschaftslehre an der #FUBerlin, analysiert, welche Rolle wirtschaftliche Sorgen und Migration gespielt haben und was von der Wirtschaftspolitik einer AfD-geführten Regierung zu erwarten wäre. 🔗 tinyurl.com/2pcdm9mt
We have an excellent line-up for our Leibniz Open Science Day on Nov 17 in Berlin - including an exciting keynote by Felix Holzmeister. Come join us and catch up on the latest in meta-scientific research! www.zbw.eu/de/ueber-uns...
📢 New paper out in the #JournalofHumanCapital with #AgataGalkiewicz and #ThomasSiedler Can starting an exam with a difficult question hurt students’ performance? We find no evidence that it does — even in incentivized assessments under time pressure.
🚨🚨🚨 Call for submissions for the first special issue of @jcre.bsky.social Anyone can submit replications on the topic of payments for ecosystem services. Details below 👇
📢 New special issue in @jcre.bsky.social : Payments for Ecosystem Services (PES) — Replications. We're seeking researchers to replicate high-quality PES papers. Fast-track review. Replication packages provided. Submission Deadline: Jan 31, 2027. Details 👉 jcr-econ.org
This year I joined the editorial team of @jcre.bsky.social, the Journal of Comments and Replications in Economics (JCRE) as a Co-Editor. I'm especially happy that the first submission I handled from start to finish has now been published—together with a reply from the original authors.
New in JCRE: Does Mask Usage Correlate with Excess Mortality? Findings from 24 European Countries. A Comment on Tausk and Spira (BMC Public Health, 2025) by Victor Rangel.
🚨 CORRIGENDUM ALERT 🚨 A decade after Star Wars: The Empirics Strike Back was published in AEJ: Applied, we've just published an official corrigendum with the AEA. This is a love story. 🧵
📢 Call for Papers! We are partnering with the Journal of Economic Surveys on a special issue: Reproducibility and Meta-Science in Economics. Submission deadline: 1 March 2027. Details in thread 🧵
Looking forward to have you at FU, Kamila @cyganrehm.bsky.social!
🗓️ Thursday, July 16: We are very happy to welcome @cyganrehm.bsky.social at the Research Seminar in Economics at @freieuniversitaet.bsky.social. She will present her work on „The Long Shadow: The Health Effects of Lost In-School Instruction Across the Life Cycle“ #EconFUBerlin #RseFUBerlin #EconSky
Our next Leibniz Open Science Day is coming up on Nov 17 in Berlin! Submit your paper if you do research on science. We welcome submissions across all areas of meta-science. Keynote by @flxhlzmstr.bsky.social! www.zbw.eu/en/about-us/...
🗓️ Thursday, July 9: We are very happy to have Alfred Guender at the Reasearch Seminar in Economics at @freieuniversitaet.bsky.social. He will present his work on „Financial Openness: Where It Matters for CPI Inflation and Where It Does Not“. #EconFUBerlin #RseFUBerlin #EconSky
⚽ Deutschland gewinnt in 90 Minuten mit 60% 🙌 Das Team spielt Unentschieden mit 23%, verliert mit 16%. Am wahrscheinlichsten ist 1:0 für Deutschland, aber auch ein 2:0 hat eine ähnlich hohe Wahrscheinlichkeit. ➡️ Zur Prognose des FB Wirtschaftswissenschaft www.fu-berlin.de/wm2026 #WM2026
Looking forward to having @jrgptrs.bsky.social in our research seminar this Thursday! Feel free to join. 12.15 Boltzmannstraße 20.
🗓️ Thursday, July 2: We are very happy to welcome Jörg Ankel-Peters at the Research Seminar in Economics at @freieuniversitaet.bsky.social. He will present his work on „Robustness in Empirical Economics: A Meta-Reproduction of 66 Articles from Leading Journals“. #EconFUBerlin #RseFUBerlin #EconSky
The debate about Borjas/Breznau's paper on ideological bias in migration research is out now @i4replication.bsky.social. With a comment by Katrin Auspurg & Josef Brüderl: hdl.handle.net/10419/341575 And a reply by the original authors: hdl.handle.net/10419/341576
There’s been a lot of buzz around the Borjas/Breznau (2026) paper (www.science.org/doi/10.1126/...) and potential ideological bias in research. We took a closer look at the data. Could there be a "bias in bias research"? Here is what we found: www.econstor.eu/bitstream/10...
econstor.eu
Es hat mir viel Spaß gemacht meine Erfahrungen mit der Co-Organisation der Berlin Replication Games 2025 im Podcast von @zbw-leibniz.bsky.social mit #DoreenSiegfried zu teilen. Replication Games zeigen, wie wertvoll gemeinsames Arbeiten an Replikationen und Reproduktionen sein kann!
In seinem persönlichen Fazit zu den Replication Games 2025 an der FU Berlin verrät uns @janmarcus.de in unserer neuen Podcastfolge, wie Wirtschaftsforschende aller Karrierestufen spielerisch an Sinn und Herausforderung von Reproduktion und Replikation herangeführt werden: zbw.to/FWIYg #OpenScience
🗓️ Thursday, June 18: We are very happy to have Jordan Norris at the Reasearch Seminar in Economics at @freieuniversitaet.bsky.social. He will present his work on „Bounding High Dimensional Comparative Statics“ #EconFUBerlin #RseFUBerlin #EconSky
🗓️ Thursday, June 11: We are very happy to welcome Andreas Knabe at the Research Seminar in Economics at @freieuniversitaet.bsky.social. He will present his work on „Income and Well-Being“ #EconFUBerlin #RseFUBerlin #EconSky
Big thanks to all participants of the 4th FUB Internal PhD Workshop in Applied Micro. @fu-berlin-vwl.bsky.social. Co-organized with @danzernatalia.bsky.social, @steinhardt.bsky.social, @janmarcus.de. Lots of exciting research projects! 👏👏
1/ Can AI help researchers check whether published social science results actually reproduce? In our new PNAS paper, we tested this directly in the AI Replication Games: 288 researchers, 103 teams, and real replication packages from quantitative social science.
🚨 New AI Games round is live 🚨 Our first AI Games paper is now out at a top general interest journal (see preprint here: www.econstor.eu/bitstream/10... So… we’re launching the next stage 👇
🗓️ Thursday, May 28: We are very happy to have Miguel Alquézar-Yus at the Reasearch Seminar in Economics at @freieuniversitaet.bsky.social. He will present his work on „The Reversal of the Mission: The Influence of Religious Leaders on Sociopolitical Attitudes“ #EconFUBerlin #RseFUBerlin #EconSky
🗓️ Thursday, May 21: We are very happy to welcome Celine Poilly at the Research Seminar in Economics at @freieuniversitaet.bsky.social. She will present her work on „The Variety Effect in Times of Uncertainty“ #EconFUBerlin #RseFUBerlin #EconSky
📘 Scott Cunningham joins @diw.de on June 15–16, 2026 for the Causal Inference – The Mixtape Master Class 2026 on Difference-in-Differences and Synthetic Control methods. Registration is open until June 1, 2026: docs.google.com/forms/d/e/1F... #causalinference #economics