@sewenz.bsky.social
Social Scientist. Senior researcher at GESIS - Leibniz Institute for the Social Sciences, Cologne. www.sewenz.com
Read our latest special issue in Survey Methodology:
➡️ Advancing Comparative Research: Exploring Error and Quality Indicators in Social Research.
Edited by @heinzleitgoeb.bsky.social, Stefanie Kley, Katharina Meitinger & Natalia Menold.
surveyinsights.org
The decline effect (Protzko & Schooler, 2017) is an observed phenomenon where effect sizes in experiments apparently diminish in size from the first paper demonstrating the effect to later replications. This has been taken as a symptom of an unhealthy scientific ecosystem, possibly caused by the "winner's curse" (selection on significance and regression to the mean), publication bias or opportunistic analyses. I show that decline effects can arise as an artifact from a much simpler source: the original article determining the sign of the effect in a meta-analysis. Moreover, such artifactual decline effects will show correlations with some of the same experimental properties that one would expect from biases from poor behavior, such as the sample size of the original study.
New draft: "Decline effects, statistical artifacts, and a meta-analytic paradox". In this manuscript I show how a common practice in meta-analysis (eg the 2015 Open Science Collaboration) creates artifactual signatures of poor scientific behavior. PDF: raw.githubusercontent.com/richarddmore... 1/x
02.02.2026 14:56 — 👍 70 🔁 28 💬 5 📌 3
science barometer 2025
The science barometer 2025 is now available! It focuses on the topic of polarisation and the role that science can play in a society that is perceived as polarised.
All results and a background paper on polarisation can be found on our website:
📊 wissenschaft-im-dialog.de/ressourcen/#...
#scicomm
Info Certificate Program 2026
📢KODAQS Data Quality Academy Certificate Program 2026 open for applications - take the currently last opportunity to register for our six-month program and become a verified data quality steward 📢
Call for Applications: www.gesis.org/en/gesis-tra...
📆Application Deadline: February 8, 2026.
Upcoming Workshops May 2026: Preprocessing and Analyzing Web Tracking Data 04 – 05 May | Hybrid (Cologne | Online) Introduction to Conjoint Survey Experiments 06 – 07 May | Online Introduction to R 06 – 08 May | Online
New skills bloom this May with #GESISworkshops 🌸
Explore:
🌐📊 Preprocessing and Analyzing Web Tracking Data
🧩📈 Introduction to Conjoint Survey Experiments
💻⏱️ Introduction to R
@gesis.org
Full program ➡️ gesis.org/training
Workshop details 🧵👇
Diagram showing four phases of methodological research (Theory, Exploration, Systematic Comparison, Evidence Synthesis) with an arrow indicating that preregistration usefulness increases from early to late phases. Each phase lists its aim, elements, outcome, and an example from factor retention research.
Does it make sense to preregister simulation studies?
This question has sparked a lot of debate.
▶️We* work through the why, when, and how
▶️We discuss different phases of methodological research to clarify where preregistration might (or might not) add value
📝 Preprint: doi.org/10.31234/osf...
📢 Finally it is out! Celebrating 40 years of ISSP and what exciting research can be done with this great data.
04.02.2026 20:10 — 👍 5 🔁 3 💬 0 📌 0
Broken link?
04.02.2026 20:08 — 👍 0 🔁 0 💬 0 📌 0
Are female economists treated differently than males in academic seminars?
These authors wanted to know whether gender shapes how scholars are treated when presenting research.
So they built a massive dataset of 2,000+ economics seminars, job talks, and conference presentations from 2019–2023...
Registration is now open! 📢
Join us for the Science:TBD Symposium — a space for exchange and discussion around emerging questions that resonate beyond disciplinary boundaries.
📍 3 & 4 March 2026, Leipzig
📝 Register now: www.idiv.de/science-tbd
#Science #Biodiversity #Symposium #ResearchCommunity
What’s a multiverse good for anyway? Julia M. Rohrer, Jessica Hullman, and Andrew Gelman Multiverse analysis has become a fairly popular approach, as indicated by the present special issue on the matter. Here, we take one step back and ask why one would conduct a multiverse analysis in the first place. We discuss various ways in which a multiverse may be employed – as a tool for reflection and critique, as a persuasive tool, as a serious inferential tool – as well as potential problems that arise depending on the specific purpose. For example, it fails as a persuasive tool when researchers disagree about which variations should be included in the analysis, and it fails as a serious inferential tool when the included analyses do not target a coherent estimand. Then, we take yet another step back and ask what the multiverse discourse has been good for and whether any broader lessons can be drawn. Ultimately, we conclude that the multiverse does remain a valuable tool; however, we urge against taking it too seriously.
New preprint! So, what's a multiverse analysis good for anyway?>
With @jessicahullman.bsky.social and @statmodeling.bsky.social
juliarohrer.com/wp-content/u...
📢 Call for Hidden Papers & Data on Ingroup Favoritism in Dictator Games
We look for unpublished and hard-to-access experimental studies for our meta-analysis!
Inclusion criteria: no deception, adults, manipulation of group membership of dictator game recipients.
All tips and data very welcome!
I wrote a blog for the Meta-Research Center expressing my infinite frustration about not getting data. What else is new, you might think? Well, I added an extra layer of annoyance directed at the journals who do NOTHING to enforce promised data sharing.
metaresearch.nl/blog/2026/2/...
More details (in German only) about the event that also celebrated the Award for Student Engagement and the Promotion of Democracy:
www.uni-konstanz.de/universitaet...
🧵 New version of our paper (@bcegerod.bsky.social) is finally online: "How Many is Enough? Sample Size in Staggered Difference-in-Differences Designs"
We show that even well-identified DiD studies are often underpowered; sample sizes needed are surprisingly large
Paper: osf.io/preprints/os... 1/6
Until we as a species can settle on which modifier key we should use to switch between "newline" and "submit" when hitting ↩ I see no future for us
03.02.2026 09:04 — 👍 25 🔁 5 💬 1 📌 0And... we're off
Join us next Spring at the University of Potsdam for the third Applied Causal Graphs workshop: applied-causal-graphs.de
Now that the date and place are set and two of the keynote speakers are fixed, all we need is an abstract from you.
The fact that CRAN now automatically generates DOIs is really great. Trivial to slurp up via Zotero and then cite package authors like they should be.
31.01.2026 22:21 — 👍 146 🔁 19 💬 3 📌 0
I've always appreciated what FreDA offers on women's and men's attitudes toward family processes! @freda-panel.bsky.social #sociology #demography
30.01.2026 11:41 — 👍 10 🔁 2 💬 0 📌 0Unbroken link: www.gesis.org/en/missy/mat...
30.01.2026 13:18 — 👍 0 🔁 0 💬 0 📌 0Call for Abstracts: multidisciplinary conference “Spatial dynamics in refugees’ multidimensional integration” (Bamberg)
Extended abstracts Submission deadline: 30 April 2026
Submission email: unetra@lifbi.de
Further information: www.lifbi.de/de-de/Start/...
ECSR Thematic Conference "Life Course and Social Stratification", University of Trento (Italy), 23-24 April 2026
Submit your abstract to: csis@unitn.it
Deadline for abstract submissions: 22 February 2026
For full details, please visit the conference website: sites.google.com/unitn.it/ecs...
#GESISPanel #DBD #Digitalization
Dealing with #AI - Topics from the first wave of data from GESIS Panel.dbd
In the survey, more than 2.000 people were asked: “What would reassure you about the increasing spread of AI technologies?”
#DatensatzdesMonats #datasetofmonth #Wissenschaftsbarometer2025 #ScienceBarometer2025
Das Wissenschaftsbarometer untersucht fortlaufend das Interesse, das Informationsverhalten und das Vertrauen der Öffentlichkeit in Wissenschaft und Forschung.
search.gesis.org/res...
Wow. 🤯
"When two years of academic work vanished with a single click"
www.nature.com/articles/d41...
#science #research #LLM #ChatGPT #AI #academicchatter #academia #openscience #replicability #nature
We are looking for a doctoral researcher to work with us on a supercool project in collaboration with linguists. The deadline is Feb 15th, contact me if you have any questions!
stellen.uni-konstanz.de/jobposting/9...
We @uni-konstanz.de are hiring a full professor in machine learning for our MSc program in Social and Economic Data Science: stellen.uni-konstanz.de/jobposting/6...
15.12.2025 14:51 — 👍 17 🔁 19 💬 0 📌 1
For absolutely no reason, let me remind people of this banger of a paper by @caroartc.bsky.social
doi.org/10.1016/j.jp...
My colleague Kevin Munger asked me and a bunch of editors to sit and think through AI and peer review. Our take:
osf.io/9sxnc/files/...
We envision an increased (!) involvement of humans in the evaluation of social science.
