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Denis Cohen

@denis-cohen.bsky.social
2.1K followers 1.1K following 45 posts

Senior research fellow @mzesunimannheim.bsky.social. Research on spatial inequalities, electoral politics, quantitative social science. Lead organizer of the MZES Social Science Data Lab (@mzes-ssdl.bsky.social). #firstgen. He/him.

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Reposted by Denis Cohen
Jacob Edenhofer @jacobedenhofer.bsky.social · 02/10/2026
For all those interested in actually understanding why the AfD did so well in Saxony-Anhalt, this dissertation by @ttichelbaecker.bsky.social is a must read! tichelbaecker.com/assets/pdf/D...
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Annika Schuster @annikaschuster.bsky.social · 02/10/2026
Happy to see our new paper on voter reactions to a breach of the cordon sanitaire out! With @jangoedeking.bsky.social, Julian Erhardt, @robert-a-huber.bsky.social and @kunkakom.bsky.social Check out Alex’ summary below! www.sciencedirect.com/science/arti...
sciencedirect.com
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Danbischof @danbischof.bsky.social · 02/10/2026
Postdoc position within my group 3 years (100% TVl-13): stellen.uni-muenster.de/jobposting/2... ⏱️ 06.11.2026 If you have questions: get in touch!
stellen.uni-muenster.de
Postdoctoral Research Associate (Wissenschaftliche*r Mitarbeiter*in, salary level E 13 TV-L)
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Tarik Abou-Chadi @tabouchadi.bsky.social · 02/10/2026
For my new research unit Politics of Democracy at the Berlin Social Science Center @wzb.bsky.social, we have 3 open research positions. 2 postdocs: 4 + 2 years (100%) 1 doc: 2 years (75%) Starting date: 1 March 2027 (negotiable) Application deadline: 1 November
Job adjob ad
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Denis Cohen @denis-cohen.bsky.social · 29/09/2026
@krausewe.bsky.social and I also want to congratulate our co-author @aigneranna.bsky.social on her first publication! 🎉🎉 Anna is a brilliant first-year PhD candidate at @gessunimannheim.bsky.social. 👉 Follow her for research on political behavior, political psychology, and personality in politics.
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Denis Cohen @denis-cohen.bsky.social · 28/09/2026
📄 New paper in @electoralstudies.bsky.social: “From the center to the fringes: A comparative test of attitudinal explanations for mainstream-to-challenger defection” 👥 with @krausewe.bsky.social and @aigneranna.bsky.social 🔗 doi.org/10.1016/j.el...
doi.org
Redirecting
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EPSS @epssnet.bsky.social · 15/09/2026
📢 The Call for Papers for EPSS 2027 is open! After a fantastic first conference in Belfast, we’re heading to Copenhagen 🇩🇰, 24–26 June 2027. ⏰ Deadline: 13 Nov 2026 👉 Call for papers: epssnet.org/2027-copenha... 1/2
epssnet.org
Call for Papers | EPSS Belfast 2026 Conference
Submit your abstract or full paper for EPSS Belfast 2026. Share cutting‑edge political science research, network with peers & contribute to academic impact.
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Arndt Leininger @aleininger.bsky.social · 15/09/2026
🧵 Just accepted @thejop.bsky.social, with @tswalve.bsky.social "What's in a name? Name recognition, place-based identities, and candidate success" Voters prefer local candidates. But how do they know who's local? Often simply from the name on the ballot👇 www.journals.uchicago.edu/doi/10.1086/...
journals.uchicago.edu
What's in a name? Name recognition, place-based identities, and candidate success | The Journal of Politics: Vol 0, No ja
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MZES Social Science Data Lab @mzes-ssdl.bsky.social · 16/09/2026
🕑 Join us *today* at 13:45 CEST for the talk 'Harnessing GPT for Enhanced Academic Writing: Evidence from a Field Experiment with Early-Career Researchers in the Social Sciences' by Marc Ratkovic (University of Mannheim) ⬇️ Zoom link and details below
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Bijan Moini @bijanmoini.de · 12/09/2026
Sie darf Staatsbürger*innen nicht wegen ihrer Abstammung diskriminieren. Ein solches Ziel wird bereits durch die begrifflich-ideologische Unterscheidung zwischen „echten“ und „Passdeutschen“ indiziert. Denn Parteien sind dazu da, aus Ideologie Politik zu machen. Wir haben aber darüberhinaus
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Tarik Abou-Chadi @tabouchadi.bsky.social · 07/09/2026
Ein letzter Post dann doch noch. Die Gesellschaft für Freiheitsrechte wird jetzt mehr gebraucht denn je. Informiert euch über ihre Arbeit. Hier kann man spenden: freiheitsrechte.org/bereit
freiheitsrechte.org
#Bereit: Schutzschild gegen Grundrechtsverstöße in Sachsen-Anhalt
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MZES Social Science Data Lab @mzes-ssdl.bsky.social · 08/09/2026
▶️ Social Science Data Lab: Fall 2026 Events Four input talks by great researchers (see below ⤵️)! 🗓️ Details & Zoom: socialsciencedatalab.mzes.uni-mannheim.de/page/events/ 👥 Organizers: @rubac.bsky.social, @denis-cohen.bsky.social, Nadia Granato and Alexander Wenz
Upcoming
2026-12-02 | Workshop | Johannes B. Gruber (GESIS – Leibniz-Institut für Sozialwissenschaften)
Vibe, Check: Authoring R Packages for Open Science in 2026 with usethis, devtools, and Coding Agents
more

2026-11-04 | Input talk | Anne-Kahtrin Stroppe (University of Greifswald)
Measuring Infrastructural Deprivation from Big Geodata: On the Inferential Validity of OpenStreetMap Proxies
more

2026-10-14 | Input talk | Valentyn Melnychuk (LMU Munich)
Causal ML for treatment effect estimation
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2026-09-16 | Input talk | Marc Ratkovic (University of Mannheim)
Harnessing GPT for Enhanced Academic Writing: Evidence from a Field Experiment with Early-Career Researchers in the Social Sciences
more
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Lukas Rudolph @lukrudolph.bsky.social · 07/09/2026
📢 Call for papers for several panels associated with the @dvpw.bsky.social Methods section for the 2027 conference in Leipzig on causal inference, survey experiments, text as data & AI, measuring democracy, data on democratic challenges, climate communication & tools for theory 📆31/10/26 Panels 🧵👇
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Tarik Abou-Chadi @tabouchadi.bsky.social · 07/09/2026
Ich habe hier zusammengefasst, wie die etablierten Parteien entscheidend zur Stärkung radikal rechter Parteien wie der AfD beigetragen haben. Auch als Reaktion auf den Wahlausgang gestern sehen wir wieder die genau gleichen Narrative aus Politik und Medien. Man bleibt im Teufelskreis gefangen.
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Korinna Lindemann @korinlind.bsky.social · 14/07/2026
One week left to apply!
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Werner Krause @krausewe.bsky.social · 13/07/2026
New working paper w/ @denis-cohen.bsky.social @rantuna.bsky.social & @turnbulldugarte.com! *Does publicly refusing to cooperate with the far right only strengthen it?* A widespread belief says yes. In this paper, we test it based on a natural experiment from Spain. tinyurl.com/5azkfnas [1/6]
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EPSS @epssnet.bsky.social · 09/07/2026
Three weeks ago, the inaugural @epssnet.bsky.social conference took place in Belfast. The enthusiasm, active participation and support from the community made this conference a huge success.
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Denis Cohen @denis-cohen.bsky.social · 07/07/2026
💡 Reminder: Open call for two additional contributions to our Special Issue "Methodological Advances for the Study of German Politics" @pvs-journal.bsky.social. 📅 Submit your abstract by the end of this week ⬇️ Details below
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Lukas Rudolph @lukrudolph.bsky.social · 04/07/2026
One day left to apply! Join us @uni-konstanz.de as #PhD researcher on Electoral Behavior, Inequality and Climate Change Policies stellen.uni-konstanz.de/jobposting/d... #AcademicJobs
stellen.uni-konstanz.de
Doctoral Researcher in Electoral Behavior, Inequality, and Climate Change Policies
Deadline: July 5th, 2026
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Korinna Lindemann @korinlind.bsky.social · 01/07/2026
📢 Job Ad: I am looking for one doctoral researcher (75%) in my newly funded DFG project on misperceptions and factual information on immigration from 1.10. or soon after! 📌 Location: MZES, University of Mannheim 💢 Application Deadline: 21st of July
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Denis Cohen @denis-cohen.bsky.social · 30/06/2026
📢 Open call for two additional contributions to our Special Issue "Methodological Advances for the Study of German Politics" @pvs-journal.bsky.social. 📄 Submit by July 12: www.sosci.uni-hamburg.de/pvs/ ℹ️ www.dvpw.de/gliederung/s... @gessler.bsky.social @lukrudolph.bsky.social @dvpw.bsky.social
Screenshot of the announcement page for the PVS Special Issue 2027, Methodological Advances for the Study of German Politics. The page introduces the open call for up to two additional contributions, summarizes the scope of the special issue, and outlines the methodological focus on contemporary German politics.
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Vicente Valentim @valentimvicente.bsky.social · 22/06/2026
Thankful to @freitag.de for this write-up about my book on the normalization of the radical right, which has recently come out in German: www.freitag.de/autoren/der-...
freitag.de
Vicente Valentim: Es gibt keinen Rechtsruck, radikale Ansichten gab es immer
Mit seinem Buch „Die Normalisierung der radikalen Rechten“ hat Vicente Valentim ein Schlüsselwerk zum Verständnis der europäischen Rechtspopulisten geliefert. Seine These: Mehr Rechtsextreme gibt es h...
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Sara Hobolt @sarahobolt.bsky.social · 21/06/2026
What a wonderful few days in Belfast for #EPSS2026 and what a fantastic community! Thank you to everyone who joined the conference with such enthusiasm A special thanks to @simonhix.bsky.social @kenbenoit.bsky.social @macartan.bsky.social & the rest of the EPSS Council for making it all possible
EPSS Council
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EPSS @epssnet.bsky.social · 17/06/2026
Many thanks to our two outgoing #EPSS Council members - @sopro.bsky.social and @markkayser.bsky.social - and welcome to our two new elected Council members @argohdes.bsky.social and @anjaneundorf.bsky.social!
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Anita Gohdes @argohdes.bsky.social · 11/06/2026
let's get a hashtag going! #EPSS2026 ?
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EPSS @epssnet.bsky.social · 08/06/2026
Are you a first generation political scientist? Then join the EPSS First Gen Social Gathering 📆10:50-12:30 Saturday, 20 June, 2026, Bar 2 (ICC) 👥Organizers: @carogarriga.bsky.social and @sattlersthomas.bsky.social Please drop by, bring your own coffee ☕️ and meet other First Gen PhDs 👩‍🎓👨‍🎓🧑‍🎓.
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EPSS @epssnet.bsky.social · 10/06/2026
Heading to the #EPSSBelfast conference next week? The EPSS Diversity Committee has organized several events to make this a welcoming space for everyone. Quick thread on what's happening and when 👇
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Julius Kölzer @juliusk.bsky.social · 15/06/2026
Also on Thursday at EPSS, my great co-author Susanna Wirthgen will present a paper with @denis-cohen.bsky.social and me on electoral responses to local rental-market interventions in Berlin. 2/2
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Lukas Rudolph @lukrudolph.bsky.social · 10/06/2026
📢 #PhD Researcher at the #PoliticalScience Department & Inequality-Cluster @uni-konstanz.de Apply by July 5 to join our @dfg.de funded team researching citizens' demand for representation amidst Green Transition infrastructure conflict #AcademicJobs Call: stellen.uni-konstanz.de/jobposting/d...
stellen.uni-konstanz.de
Doctoral Researcher in Electoral Behavior, Inequality, and Climate Change Policies
Deadline: July 5th, 2026
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Werner Krause @krausewe.bsky.social · 09/06/2026
New paper out in the @thejop.bsky.social (w/ @christinagahn.bsky.social) Do opinion polls shape election results? Using both cross-national data and a survey experiment, the answer we find is yes - though it depends on how we communicate polling results. www.journals.uchicago.edu/doi/10.1086/...
Image showing the abstract of the paper "Self-Fulfilling Prophecies at the Voting Booth" by Werner Krause and Christina Gahn, published in the Journal of Politics. The abstract describes a quasi-experimental study across 25 countries finding that parties polling just below electoral thresholds are approximately 45 percentage points less likely to clear them, and that this effect diminishes when voters are informed about polling uncertainty.
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Konstantin Bogatyrev @bogatyrev.bsky.social · 21/05/2026
New paper w/ @lstoetze.bsky.social "Estimating Treatment Effects on Proportions with Synthetic Controls" out in @polanalysis.bsky.social 👀 When your outcomes are compositional (such as vote shares), applying synthetic controls separately to each part can break the math. We show how to fix it: 🧵
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Isabelle Guinaudeau @iguinaudeau.bsky.social · 07/05/2026
Can France still be governed under its current electoral system? After almost two years of parliamentary fragmentation, the situation remains unsettled: huge frustration, no stable majority and a presidential election already casting its polarising shadow over parliamentary life.
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Danbischof @danbischof.bsky.social · 28/04/2026
📄 New paper with a fantastic MA student @jmschulte.bsky.social: When social democrats move right on migration, do voters actually follow? We study Olaf Scholz's radical shift on migration in Germany (October 2023).
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Or Tuttnauer @ortuttnauer.com · 18/04/2026
Anyone has any idea how many European politicians have a @bsky.app account? #polisky
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MZES Social Science Data Lab @mzes-ssdl.bsky.social · 14/04/2026
🚨 Upcoming: "AIn't Nothing But a Survey? Using Large Language Models for Coding Open-Ended Survey Responses" 👤 Leah von der Heyde (GESIS) 🗓️ Wed, April 22, 13:45-15:15 CET 📺 Register for the live stream: us02web.zoom.us/meeting/regi... 🔗 socialsciencedatalab.mzes.uni-mannheim.de/page/events/
2026-04-22 | Input talk | Leah von der Heyde (GESIS)
AIn't Nothing But a Survey? Using Large Language Models for Coding Open-Ended Survey Responses

Hybrid event [A5, 6, Room A231 + Zoom]
April 22, 2026, 13:45-15:15

Abstract
Large language models (LLMs) have the potential to make survey research more efficient, including the classification of open-ended survey responses. However, as most existing research on this topic has focused on English-language text or single LLMs, it is unclear whether their applicability generalizes and how the quality of classifications compares to established methods. In this talk, I will demonstrate how LLMs can be used for coding open-ended responses using different access options and prompting and fine-tuning techniques. I will present a study testing these approaches on a dataset of German open-ended survey responses, comparing several LLMs to human coders and other automated methods. Finally, I will discuss the implications of the study findings for practitioners, including the many trade-offs researchers need to consider.

Presenter(s)
Leah von der Heyde is a computational social scientist and survey methodologist. Her research focuses on the potential and pitfalls of new data sources, such as large language models, for improving the measurement and representation of public opinion. Substantively, she is particularly interested in political attitudes and voting behavior. Leah received her PhD in Social Data Science and Research Methodology from the University of Mannheim. She has a background in political science from LMU Munich, the University of Mannheim, and Georgetown University. Previously, Leah was part of the Social Data Science and AI Lab at LMU Munich, worked for the European Social Survey at GESIS - Leibniz Institute for the Social Sciences, the European Parliamentary Research Service, and several market and public opinion research institutes in Germany and Sweden. At GESIS, she is part of KODAQS, researching and educating…
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Korinna Lindemann @korinlind.bsky.social · 13/04/2026
An @lseeuroppblog.bsky.social post on our recently published paper in @psrm.bsky.social is now available! 👇
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Christoph Valentin Steinert @chrisvsteinert.bsky.social · 26/03/2026
The German public is more approving of police violence when victims are immigrants, and this bias is highly resistant to new information. This shows our new study published in Science Advances. www.science.org/doi/10.1126/... (1/3)
science.org
Public opinion on police misconduct: Discrimination and information resistance
The German public is more approving of police violence when victims are immigrants, and this bias is resistant to new information.
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Reto Mitteregger @indubioproreto.bsky.social · 25/03/2026
Since the narrative of “young right-wing men” persists so — here are some findings/patterns from the representative election statistics of the various German federal states. Spoiler: *IN NO GERMAN STATE DO MEN AGED 18–24 VOTE FOR THE AfD MORE THAN MEN AGED 35–60.*
AfD vote shares by gender and age in all federal states. 
State elections: Bavaria, Berlin, Brandenburg, Bremen, Hamburg, Hesse, Mecklenburg-Western Pomerania (*=2021 state election held on the same day as the federal election), Lower Saxony, North Rhine-Westphalia, Saxony, Saxony-Anhalt, Thuringia. 

Federal elections: Baden-Württemberg, Rhineland-Palatinate (as no data is yet available for the 2026 state elections), Saarland, Schleswig-Holstein (no representative election statistics for state elections)
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Kai Arzheimer @kai-arzheimer.com · 25/03/2026
'Hey, look at #Denmark! Social Democrats can stay relevant and marginalise the #farright by becoming - get this! - a bit like the far right!' Parrotted by every medium, contemplated by every SD party, ridiculed by every political scientist.
Results from the Danish general election 2026
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Bastian Becker @beckerbastian.bsky.social · 18/03/2026
Also finding it hard to keep up with new research? I built something to fix this. SciLove — swipe through recent papers in your field. The feed learns from your saves. Also matches you with researchers saving your work back (opt-out if you prefer). www.scilove.app 3,000+ journals, updated daily
scilove.app
SciLove — Discover new research on the go
A personalized feed of the latest peer-reviewed papers — swipe to save, skip, and make connections in minutes a day.
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Denis Cohen @denis-cohen.bsky.social · 17/03/2026
Great to see this go live 👇 As part of the EPSS Diversity Committee, I’m especially excited about this mentoring program—open to all EPSS members, both as mentors and as mentees. 🗓️ Fill out the survey by March 31 to participate. ℹ️ FAQ: epssnet.org/about/divers...
epssnet.org
Mentorship program - EPSS
The EPSS Diversity Committee is happy to announce the launch of our mentoring program. This initiative builds on the success of this scheme by the LGBTQ+ group in previous years. The EPSS Mentoring Program is a new initiative designed  to develop a new network of contacts within the EPSS community.  Our mentoring program is designed …
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Denis Cohen @denis-cohen.bsky.social · 10/03/2026
⏰ Last chance to register for my GESIS course ▶️ Bayesian Modeling: From Foundations to Custom Solutions 📅 Apr 16–17 & 23–24 (online) We cover: • Foundations of Bayesian inference • Applied modeling with brms in R • Building custom models in Stan Feel free to get in touch if you have questions.
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Denis Cohen @denis-cohen.bsky.social · 10/03/2026
Join us tomorrow for this exciting talk by @ankuepfer.bsky.social in the MZES Social Science Data Lab! Details and Zoom link ⬇️
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Thomas Sattler @sattlersthomas.bsky.social · 05/03/2026
Paper w/ @carogarriga.bsky.social: Academia’s Class Problem. PoliSci is dominated by the upper middle class / people with parents who went to university – unlike society as a whole. dx.doi.org/10.2139/ssrn...
dx.doi.org
Academia's Class Problem: First-Generation Scholars in Political Science
Political scientists devote a massive amount of attention to socioeconomic background of political actors and descriptive representation in political institutio
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Hannah Rajski @hannahrajski.bsky.social · 02/03/2026
Am Sonntag ist Landtagswahl in Baden-Württemberg. Was sagt das Zweistimme.org Modell vorher? ⬇️
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EPSS @epssnet.bsky.social · 04/03/2026
EPSS Travel Grants for 2026 Belfast conference: PhD students & junior scholars @ institutions in European countries that are often underrepresented, can apply for full fee waiver & £500 stipend Apply: lnkd.in/ehXjhCgf Deadline: March 8, 11:59pm GMT. More details: lnkd.in/eZTP5sWR
lnkd.in
LinkedIn
This link will take you to a page that’s not on LinkedIn
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Denis Cohen @denis-cohen.bsky.social · 25/02/2026
⏰ Starting in 5 min ⬇️ Zoom link below
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Denis Cohen @denis-cohen.bsky.social · 24/02/2026
Join us tomorrow for this exciting talk by @klaramueller.bsky.social in the MZES Social Science Data Lab! Details and Zoom link ⬇️
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DVPW @dvpw.bsky.social · 19/02/2026
‼️ The editorial board of @pvs-journal.bsky.social invites proposals for a special issue in 2027: 👉 www.dvpw.de/informatione... Submit your proposals by 31 May 2026 to pvs-redaktion@dvpw.de #CfP #PVS #GPSQ #PolSci #specialissue #Journal
Grafik mit grauem Hintergrund und Schrift in weiß/beige/gelb. Unten rechts das DVPW-Logo in weiß. Text: Deutsche Vereinigung für Politikwissenschaft. Call for Proposals: PVS/GPSQ Special Issue 2027. Proposals should be preferably in English language, devoted to a topic of general interest to the discipline, relevant across different subfields. Send your proposal by 31 May 2026 to pvs-redaktion@dvpw.de.
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MZES Social Science Data Lab @mzes-ssdl.bsky.social · 09/02/2026
▶️ Social Science Data Lab: Spring 2026 Events Four input talks by great researchers (see below ⤵️)! 🗓️ Details & Zoom: socialsciencedatalab.mzes.uni-mannheim.de/page/events/ 👥 Organizers: @rubac.bsky.social, @denis-cohen.bsky.social and Alexander Wenz
Upcoming

2026-05-13 | Input talk | Lion Behrens (Data Scientist & Independent Researcher)
Modeling Causal Heterogeneity with Machine Learning
more

2026-04-22 | Input talk | Leah von der Heyde (GESIS)
AIn't Nothing But a Survey? Using Large Language Models for Coding Open-Ended Survey Responses
more

2026-03-11 | Input talk | Andreas Küpfer (TU Darmstadt & University of Birmingham)
Politics in Action: Studying Multimodal Data from Local Meetings to National Parliaments
more

2026-02-25 | Input talk | Klara Müller (University of Mannheim)
When Events Change Samples: Disentangling Causal Effects from Compositional Bias in Quasi-Experimental Designs
more
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