Andreas Brandmaier
@brandmaier.bsky.social
Research Methods. Multivariate Models. Individual differences. Lifespan. Reproducibility. R. Views are my own but you can keep them.
Reposted by Andreas Brandmaier
What your audience is thinking about at your conference presentation. Cartoon from @upmicblog. #PhDchat #ECRchat #postdoc #gradschool
October 23, 2025 at 3:30 AM
What your audience is thinking about at your conference presentation. Cartoon from @upmicblog. #PhDchat #ECRchat #postdoc #gradschool
Reposted by Andreas Brandmaier
@nature.com made a news piece on our new @pnas.org paper. Good job Anne Ravndal!
Men’s brains shrink faster than women’s: what that means for Alzheimer’s.
www.nature.com/articles/d41...
Men’s brains shrink faster than women’s: what that means for Alzheimer’s.
www.nature.com/articles/d41...
October 14, 2025 at 6:25 AM
@nature.com made a news piece on our new @pnas.org paper. Good job Anne Ravndal!
Men’s brains shrink faster than women’s: what that means for Alzheimer’s.
www.nature.com/articles/d41...
Men’s brains shrink faster than women’s: what that means for Alzheimer’s.
www.nature.com/articles/d41...
Reposted by Andreas Brandmaier
#DataMethods #OpenScience
#GESISMethodsHub: An open portal for computational social science research—find tools, tutorials, and code, directly usable in your browser. Methods Hub makes it easy to learn, apply, and reproduce computational methods in the Social Sciences.
methodshub.gesis.org/
#GESISMethodsHub: An open portal for computational social science research—find tools, tutorials, and code, directly usable in your browser. Methods Hub makes it easy to learn, apply, and reproduce computational methods in the Social Sciences.
methodshub.gesis.org/
October 15, 2025 at 8:00 AM
#DataMethods #OpenScience
#GESISMethodsHub: An open portal for computational social science research—find tools, tutorials, and code, directly usable in your browser. Methods Hub makes it easy to learn, apply, and reproduce computational methods in the Social Sciences.
methodshub.gesis.org/
#GESISMethodsHub: An open portal for computational social science research—find tools, tutorials, and code, directly usable in your browser. Methods Hub makes it easy to learn, apply, and reproduce computational methods in the Social Sciences.
methodshub.gesis.org/
Psychological Methods is looking for Editorial Fellows. We are looking forward to applications of early-career psychologists who will bring experiential diversity to their work. If you are interested, reach out to me or directly apply here to work with a wonderful team: www.apa.org/pubs/journal...
www.apa.org
September 16, 2025 at 12:16 PM
Psychological Methods is looking for Editorial Fellows. We are looking forward to applications of early-career psychologists who will bring experiential diversity to their work. If you are interested, reach out to me or directly apply here to work with a wonderful team: www.apa.org/pubs/journal...
Anke Schneider and I put together a short brochure on sample size planning, aimed at Bachelor psychology students. Our goal: help students justify their sample size plan (other than just relying on defaults) and help avoid common pitfalls. 🚀
For now, it’s only available in German.
osf.io/n46vg/
For now, it’s only available in German.
osf.io/n46vg/
September 8, 2025 at 9:42 AM
Anke Schneider and I put together a short brochure on sample size planning, aimed at Bachelor psychology students. Our goal: help students justify their sample size plan (other than just relying on defaults) and help avoid common pitfalls. 🚀
For now, it’s only available in German.
osf.io/n46vg/
For now, it’s only available in German.
osf.io/n46vg/
Reposted by Andreas Brandmaier
A new preregistration template for simulation studies is now live on OSF. Thanks to the creators and the preregistration template working group for proposing and shepherding this to make it available to users.
See the post if you would like to propose a new template.
www.cos.io/blog/introdu...
See the post if you would like to propose a new template.
www.cos.io/blog/introdu...
Introducing the Simulation Studies Preregistration Template: Q&A with Björn S. Siepe, František Bartoš, and Samuel Pawel
Initially submitted through COS’s open call for community-designed preregistration templates, the Simulation Studies Template is now part of the expanding collection of preregistration resources avail...
www.cos.io
July 29, 2025 at 1:49 PM
A new preregistration template for simulation studies is now live on OSF. Thanks to the creators and the preregistration template working group for proposing and shepherding this to make it available to users.
See the post if you would like to propose a new template.
www.cos.io/blog/introdu...
See the post if you would like to propose a new template.
www.cos.io/blog/introdu...
New preprint: Stop thinking of Cohen's d as an effect size.
Cohen's d confounds magnitude of effect and reliability. Yet, we pretend our measurements are flawless when interpreting it. What if we thought of Cohen’s d as a measure of detectability instead?
osf.io/preprints/ps...
Cohen's d confounds magnitude of effect and reliability. Yet, we pretend our measurements are flawless when interpreting it. What if we thought of Cohen’s d as a measure of detectability instead?
osf.io/preprints/ps...
July 29, 2025 at 2:30 PM
New preprint: Stop thinking of Cohen's d as an effect size.
Cohen's d confounds magnitude of effect and reliability. Yet, we pretend our measurements are flawless when interpreting it. What if we thought of Cohen’s d as a measure of detectability instead?
osf.io/preprints/ps...
Cohen's d confounds magnitude of effect and reliability. Yet, we pretend our measurements are flawless when interpreting it. What if we thought of Cohen’s d as a measure of detectability instead?
osf.io/preprints/ps...
New study out in Nature Medicine: Education does not protect against age-related decline of memory. Read more here: Reevaluating the role of education on cognitive decline and brain aging in longitudinal cohorts across 33 Western countries www.nature.com/articles/s41...
Reevaluating the role of education on cognitive decline and brain aging in longitudinal cohorts across 33 Western countries - Nature Medicine
In a large cross-national study, education was linked to better memory and larger brain volumes but not to slower cognitive or brain decline with age, suggesting that the association reflects early-li...
www.nature.com
July 28, 2025 at 2:59 PM
New study out in Nature Medicine: Education does not protect against age-related decline of memory. Read more here: Reevaluating the role of education on cognitive decline and brain aging in longitudinal cohorts across 33 Western countries www.nature.com/articles/s41...
Reposted by Andreas Brandmaier
In my latest (and last!) column for Science’s Expert Voices series, I write about the reasons behind AI chatbots’ “deceptive” behaviors (and why Claude threatened a fictional CEO with blackmail).
www.science.org/doi/10.1126/...
www.science.org/doi/10.1126/...
Why AI chatbots lie to us
A few weeks ago, a colleague of mine needed to collect and format some data from a website, and he asked the latest version of Anthropic’s generative AI system, Claude, for help. Claude cheerfully agr...
www.science.org
July 24, 2025 at 6:24 PM
In my latest (and last!) column for Science’s Expert Voices series, I write about the reasons behind AI chatbots’ “deceptive” behaviors (and why Claude threatened a fictional CEO with blackmail).
www.science.org/doi/10.1126/...
www.science.org/doi/10.1126/...
Want automated reproducibility checks for your R Markdown docs on GitHub?
reproducibleRchunks v1.2.0 is now on CRAN!
✅ Generates GitHub Actions for cloud-based reproducibility checks (with cool badges)
📦 Supports renv for dependency management
👉 cran.r-project.org/package=repr...
reproducibleRchunks v1.2.0 is now on CRAN!
✅ Generates GitHub Actions for cloud-based reproducibility checks (with cool badges)
📦 Supports renv for dependency management
👉 cran.r-project.org/package=repr...
July 24, 2025 at 12:36 PM
Want automated reproducibility checks for your R Markdown docs on GitHub?
reproducibleRchunks v1.2.0 is now on CRAN!
✅ Generates GitHub Actions for cloud-based reproducibility checks (with cool badges)
📦 Supports renv for dependency management
👉 cran.r-project.org/package=repr...
reproducibleRchunks v1.2.0 is now on CRAN!
✅ Generates GitHub Actions for cloud-based reproducibility checks (with cool badges)
📦 Supports renv for dependency management
👉 cran.r-project.org/package=repr...
Reposted by Andreas Brandmaier
love when a paywall sounds like it’s drawing a gun on you
July 23, 2025 at 1:54 PM
love when a paywall sounds like it’s drawing a gun on you
July 18, 2025 at 4:22 PM
Reposted by Andreas Brandmaier
Interested in the latest metascience? Come to Eindhoven October 17th to listen to Dr. Duygu Uygun-Tunç (University of Chicago) and Dr. Lisa Spitzer (Leibniz-Institut für Psychologie) as keynote speakers, and Dr. Aaron Peikert for a workshop collaboration through Git! All free!
🚨 Registration is now open for the PMGS Meta-Research Symposium 2025!
📝 Abstract submissions are still welcome—deadline: July 31.
Plus: join our mini-workshop on coordination using GitHub on the afternoon of October 16.
Find all the details & sign up here:
paulmeehlschool.github.io/2025-07-16-s...
📝 Abstract submissions are still welcome—deadline: July 31.
Plus: join our mini-workshop on coordination using GitHub on the afternoon of October 16.
Find all the details & sign up here:
paulmeehlschool.github.io/2025-07-16-s...
Registration Now Open: Meta-Research Symposium 2025 & Pre-Symposium Mini-Workshop | Paul Meehl Graduate School
We are delighted to announce that registration is now open for the second round of the Paul Meehl Graduate School’s...
paulmeehlschool.github.io
July 16, 2025 at 6:53 PM
Interested in the latest metascience? Come to Eindhoven October 17th to listen to Dr. Duygu Uygun-Tunç (University of Chicago) and Dr. Lisa Spitzer (Leibniz-Institut für Psychologie) as keynote speakers, and Dr. Aaron Peikert for a workshop collaboration through Git! All free!
The German Research Foundation @dfg.de publishes the English edition of their Funding Atlas!
Out now: the English edition of our Funding Atlas! Key Figures Relating to Publicly Funded Research in Germany - with comprehensive and subject-specific analyses of how successful German universities / research institutions have been in acquiring third-party funding.
Visit foerderatlas.dfg.de/en/
Visit foerderatlas.dfg.de/en/
German Research Funding Atlas | Third-party funded research in Germany
Where in Germany does the most publicly funded research take place? The report shows figures and rankings of federal states, regions, universities and research institutions - and how they work togethe...
foerderatlas.dfg.de
July 11, 2025 at 9:27 AM
The German Research Foundation @dfg.de publishes the English edition of their Funding Atlas!
Reposted by Andreas Brandmaier
Thrilled to see our TinyRNN paper in @nature! We show how tiny RNNs predict choices of individual subjects accurately while staying fully interpretable. This approach can transform how we model cognitive processes in both healthy and disordered decisions. doi.org/10.1038/s415...
Discovering cognitive strategies with tiny recurrent neural networks - Nature
Modelling biological decision-making with tiny recurrent neural networks enables more accurate predictions of animal choices than classical cognitive models and offers insights into the underlying cog...
doi.org
July 2, 2025 at 7:03 PM
Thrilled to see our TinyRNN paper in @nature! We show how tiny RNNs predict choices of individual subjects accurately while staying fully interpretable. This approach can transform how we model cognitive processes in both healthy and disordered decisions. doi.org/10.1038/s415...
CRAN release of reproducibleRchunks v1.1.0 - now with full support of all standard knitr code chunk options.
There are also some example vignettes to get you started: brandmaier.github.io/reproducible...
or just read our Open Access article in Collabra: Psychology: doi.org/10.1525/coll... #rstats
There are also some example vignettes to get you started: brandmaier.github.io/reproducible...
or just read our Open Access article in Collabra: Psychology: doi.org/10.1525/coll... #rstats
Automated Reproducibility Testing in R Markdown
Computational results are considered reproducible if the same computation on the same data yields the same results if performed on a different computer or on the same computer later in time. Reproduci...
doi.org
July 2, 2025 at 2:03 PM
CRAN release of reproducibleRchunks v1.1.0 - now with full support of all standard knitr code chunk options.
There are also some example vignettes to get you started: brandmaier.github.io/reproducible...
or just read our Open Access article in Collabra: Psychology: doi.org/10.1525/coll... #rstats
There are also some example vignettes to get you started: brandmaier.github.io/reproducible...
or just read our Open Access article in Collabra: Psychology: doi.org/10.1525/coll... #rstats
@anoukbouma.bsky.social makes wonderful remarks on how scientific software often misses users' need. Where is the: "Design, test, and iterate" cycle in scientific software?
I wrote a blogpost on something I’ve been thinking about a lot lately: how metascientists could (and should) think more about their users when designing tools and reforms.
Would love to hear any thoughts on this topic!
#metascience #usercentered
Would love to hear any thoughts on this topic!
#metascience #usercentered
When Good Tools Fail: The Missing Step in Scientific Reform — Meta-Research Center
This blogpost was written by Anouk Bouma. Anouk her PhD project focuses on studying and enhancing various interventions for improving scientific robustness at journal level, supervised by Marcel van A...
tinyurl.com
July 1, 2025 at 8:53 AM
@anoukbouma.bsky.social makes wonderful remarks on how scientific software often misses users' need. Where is the: "Design, test, and iterate" cycle in scientific software?
Reposted by Andreas Brandmaier
A few months ago, Nature published how-to guide for using ChatGPT to write your peer reviews in 30 minutes.
This is, of course, a horrible idea. Here’s my response with @jbakcoleman.bsky.social .
This is, of course, a horrible idea. Here’s my response with @jbakcoleman.bsky.social .
AI, peer review and the human activity of science
When researchers cede their scientific judgement to machines, we lose something important.
www.nature.com
June 25, 2025 at 1:01 PM
A few months ago, Nature published how-to guide for using ChatGPT to write your peer reviews in 30 minutes.
This is, of course, a horrible idea. Here’s my response with @jbakcoleman.bsky.social .
This is, of course, a horrible idea. Here’s my response with @jbakcoleman.bsky.social .
Reposted by Andreas Brandmaier
PCI Psychology is here!! 🎉🥳
After over a year of hard work by so many people, we are thrilled to announce that we are open for submissions! Join us in making publishing more efficient, equitable, and open: psych.peercommunityin.org
#PsychSciSky #scipub
After over a year of hard work by so many people, we are thrilled to announce that we are open for submissions! Join us in making publishing more efficient, equitable, and open: psych.peercommunityin.org
#PsychSciSky #scipub
June 11, 2025 at 11:03 PM
PCI Psychology is here!! 🎉🥳
After over a year of hard work by so many people, we are thrilled to announce that we are open for submissions! Join us in making publishing more efficient, equitable, and open: psych.peercommunityin.org
#PsychSciSky #scipub
After over a year of hard work by so many people, we are thrilled to announce that we are open for submissions! Join us in making publishing more efficient, equitable, and open: psych.peercommunityin.org
#PsychSciSky #scipub
What? How? Why?
June 12, 2025 at 10:46 AM
What? How? Why?
Out now in Collabra: Psychology: Automated Reproducibility Testing in R Markdown.
The R package reproducibleRchunks, which stores metadata about original computational results and verifies later reproduction attempts automatically. online.ucpress.edu/collabra/art...
The R package reproducibleRchunks, which stores metadata about original computational results and verifies later reproduction attempts automatically. online.ucpress.edu/collabra/art...
June 10, 2025 at 9:22 AM
Out now in Collabra: Psychology: Automated Reproducibility Testing in R Markdown.
The R package reproducibleRchunks, which stores metadata about original computational results and verifies later reproduction attempts automatically. online.ucpress.edu/collabra/art...
The R package reproducibleRchunks, which stores metadata about original computational results and verifies later reproduction attempts automatically. online.ucpress.edu/collabra/art...
Reposted by Andreas Brandmaier
New paper in Imaging Neuroscience by Didac Vidal-Piñeiro, Anders M. Fjell, et al:
Reliability of structural brain change in cognitively healthy adult samples
doi.org/10.1162/imag...
Reliability of structural brain change in cognitively healthy adult samples
doi.org/10.1162/imag...
April 28, 2025 at 11:14 AM
New paper in Imaging Neuroscience by Didac Vidal-Piñeiro, Anders M. Fjell, et al:
Reliability of structural brain change in cognitively healthy adult samples
doi.org/10.1162/imag...
Reliability of structural brain change in cognitively healthy adult samples
doi.org/10.1162/imag...
Reposted by Andreas Brandmaier
This is a must-read. Csaba Szabó, the author of Unreliable, was approached by a paper mill, and he decided to conduct a sting operation. He documented how paper mills operate.
forbetterscience.com/2025/05/19/a...
forbetterscience.com/2025/05/19/a...
A Sting Inside a Papermill
“It’s clear that any academically corrupt individual — particularly one with editorial connections — could easily “place” dozens of these Anzen products into indexed journals and collect a ha…
forbetterscience.com
May 19, 2025 at 6:06 AM
This is a must-read. Csaba Szabó, the author of Unreliable, was approached by a paper mill, and he decided to conduct a sting operation. He documented how paper mills operate.
forbetterscience.com/2025/05/19/a...
forbetterscience.com/2025/05/19/a...
Reposted by Andreas Brandmaier
Clarivate to stop counting citations to retracted articles in journals’ impact factors
Clarivate to stop counting citations to retracted articles in journals’ impact factors
Clarivate will no longer include citations to and from retracted papers when calculating journal impact factors, the company announced today. The change comes after some have wondered over th…
retractionwatch.com
May 15, 2025 at 11:06 AM
Clarivate to stop counting citations to retracted articles in journals’ impact factors
Reposted by Andreas Brandmaier
Thanks to everybody who chimed in!
I arrived at the conclusion that (1) there's a lot of interesting stuff about interactions and (2) the figure I was looking for does not exist.
So, I made it myself! Here's a simple illustration of how to control for confounding in interactions:>
I arrived at the conclusion that (1) there's a lot of interesting stuff about interactions and (2) the figure I was looking for does not exist.
So, I made it myself! Here's a simple illustration of how to control for confounding in interactions:>
May 11, 2025 at 5:34 AM
Thanks to everybody who chimed in!
I arrived at the conclusion that (1) there's a lot of interesting stuff about interactions and (2) the figure I was looking for does not exist.
So, I made it myself! Here's a simple illustration of how to control for confounding in interactions:>
I arrived at the conclusion that (1) there's a lot of interesting stuff about interactions and (2) the figure I was looking for does not exist.
So, I made it myself! Here's a simple illustration of how to control for confounding in interactions:>