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Andreas Brandmaier

@brandmaier.bsky.social
1.5K followers 695 following 95 posts

Research Methods. Multivariate Models. Individual differences. Lifespan. Reproducibility. R. Views are my own but you can keep them.

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Andreas Brandmaier @brandmaier.bsky.social · 28/09/2026
Ever looked at your graph and thought: this needs a more dramatic exit strategy? Make your R base plots self-destruct with style. If you must, download here: github.com/brandmaier/d... #RStats #DataVisualization #RProgramming #DataScience #OpenSource #AcademicHumor #noAI
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Andreas Brandmaier @brandmaier.bsky.social · 30/07/2026
Meet Ωnyx - our open-source GUI for structural equation models #onyx #sem #latentvariables This is the latest SaaS-style promo video by the incredible Jonathan B. #noai Video: www.youtube.com/watch?v=yaql... Download at onyx-sem.com
youtube.com
Onyx - An open-source GUI for Structural Equation Modeling
YouTube video by Prof. Brandmaier (Research Methods)
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Center for Lifespan Psychology, MPI for Human Development @lipmpib.bsky.social · 01/06/2026
👉 An exciting PhD position is available at the MPI for Human Development to work with LIP colleague @sarahdpower.bsky.social on the WildBrain project. See www.mpib-berlin.mpg.de/2366555/2026.... #PsychSciSky #neuroskyence
mpib-berlin.mpg.de
PhD Position | Center for Lifespan Psychology
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Andreas Brandmaier @brandmaier.bsky.social · 01/06/2026
Cohen’s d is one of the most widely used ways to communicate mean differences across studies. But what, exactly, is it telling us? A perspective on detectability of effects -- just out in PARE: openpublishing.library.umass.edu/pare/article... #openaccess
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Anders M Fjell @andersfjell.bsky.social · 25/05/2026
Up to age 60, adult brain volume completely dominated by stable individual diffs. At 80 yrs, up to 50% reflects differences in change. Interpretation: 1) We change similarly up to 60. 2) Group comparisons often not reflecting changes. @Edvardosg @LCBC_UiO direct.mit.edu/imag/article...
direct.mit.edu
Stable Individual Differences Dominate Adult Brain Volume Variation Until Later Life
Abstract. Individual differences in the volumes of brain structures are often linked to various conditions, including Alzheimer’s disease, schizophrenia, and overall brain health. However, it remains ...
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Julia M. Rohrer @dingdingpeng.the100.ci · 18/12/2025
Just gave my last talk of the year! 2025 was quite packed, I gave talks about: - the age-period-cohort problem - making rigorous causal inference more mainstream - mediation analysis - marginaleffects - causal graphs (x10) If you're curious, check out my slides here: juliarohrer.com/resources/
juliarohrer.com
Resources
Here you can find a collection of things that may be helpful, including slide decks, a curated list of introductory papers and blog posts, as well as some infographics I have generated to explain v…
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ithinkwellhugh.bsky.social @ithinkwellhugh.bsky.social · 23/10/2025
What your audience is thinking about at your conference presentation. Cartoon from @upmicblog. #PhDchat #ECRchat #postdoc #gradschool
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Anders M Fjell @andersfjell.bsky.social · 14/10/2025
@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...
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GESIS - Leibniz-Institut für Sozialwissenschaften @gesis.org · 15/10/2025
#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/
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Andreas Brandmaier @brandmaier.bsky.social · 16/09/2025
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...
apa.org
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Andreas Brandmaier @brandmaier.bsky.social · 08/09/2025
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/
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Brian Nosek @briannosek.bsky.social · 29/07/2025
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...
cos.io
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...
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Andreas Brandmaier @brandmaier.bsky.social · 29/07/2025
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...
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Andreas Brandmaier @brandmaier.bsky.social · 28/07/2025
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...
nature.com
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...
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Melanie Mitchell @melaniemitchell.bsky.social · 24/07/2025
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/...
science.org
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...
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Andreas Brandmaier @brandmaier.bsky.social · 24/07/2025
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...
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Bobsession @bobservo.bsky.social · 23/07/2025
love when a paywall sounds like it’s drawing a gun on you
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Andreas Brandmaier @brandmaier.bsky.social · 18/07/2025
Finally: Ecologically valid MRI studies. Seen at Max Planck Campus of Cognition #noai
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Daniel Lakens @lakens.bsky.social · 16/07/2025
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!
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Andreas Brandmaier @brandmaier.bsky.social · 11/07/2025
The German Research Foundation @dfg.de publishes the English edition of their Funding Atlas!
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Marcelo Mattar @marcelomattar.bsky.social · 02/07/2025
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...
doi.org
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...
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Andreas Brandmaier @brandmaier.bsky.social · 02/07/2025
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
doi.org
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...
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Andreas Brandmaier @brandmaier.bsky.social · 01/07/2025
@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?
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Carl T. Bergstrom @carlbergstrom.com · 25/06/2025
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 .
nature.com
AI, peer review and the human activity of science
When researchers cede their scientific judgement to machines, we lose something important.
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PCI Psychology @psych.peercommunityin.org · 12/06/2025
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
psych.peercommunityin.org
PCI Psychology
Peer Community in Psychology
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Andreas Brandmaier @brandmaier.bsky.social · 12/06/2025
What? How? Why?
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Andreas Brandmaier @brandmaier.bsky.social · 10/06/2025
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...
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Imaging Neuroscience @imagingneurosci.bsky.social · 28/04/2025
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...
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Anna Abalkina @abalkina.bsky.social · 19/05/2025
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
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…
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Retraction Watch @retractionwatch.com · 15/05/2025
Clarivate to stop counting citations to retracted articles in journals’ impact factors
retractionwatch.com
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…
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Julia M. Rohrer @dingdingpeng.the100.ci · 11/05/2025
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:>
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Andreas Brandmaier @brandmaier.bsky.social · 07/05/2025
You want to fit structural equation models in Julia? No problem with the StructuralEquationModels.jl package. Ships with worked examples and tutorials on how to modify the objective function easily (e.g., adding a regularization penalty). Find our preprint here osf.io/preprints/ps...
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Psychometric Society @pmetricsoc.bsky.social · 12/03/2025
New updates to Psychometrika! - Theory & Methods now also accepts focus articles with discussion/rejoinder - Book Review is now Review Section, and includes more topics (lit, book, software, media) - ARCS is now “Applications and Case Studies,” and includes software as a category
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Johannes Haushofer @johanneshaushofer.com · 15/04/2025
Remember the "Highlights" that some Elsevier journals require? Dean Karlan and friends developed an amazing way to troll them: haikus!
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embar nitwitzer @amberwiznitzer.bsky.social · 08/04/2025
ik weet eigenlijk niet eens waarom ik de moeite heb gedaan om ze naast elkaar te zetten maar goed het is nu toch al gebeurd
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MINOR revision @handle.invalid · 02/04/2025
#AcademicSky #SciPub #PeerReview #PhDSky #OpenScience #AcademicResearch #AcademicWriting #ScholarlyPublishing #AcademicPublishing #AcademicChatter #Comics 🧪
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Yorgos @gd047.bsky.social · 01/04/2025
​The new {dockitect} R package offers a pipe-friendly API to streamline the creation and management of Dockerfiles, enhancing reproducibility and deployment in #rstats projects. Learn more about its features and benefits here: blog.thecoatlessprofessor.com/programming/...
blog.thecoatlessprofessor.com
Introducing dockitect: Making Docker Feel More Native to R – TheCoatlessProfessor
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Anders M Fjell @andersfjell.bsky.social · 31/03/2025
Preprint from @didacvp.bsky.social - a common brain factor underlying memory decline in older age. Stronger associations in older, but independent of genetic Alzheimer risk. Very interesting work using >10.000 MRI scan. @LCBC_UiO www.biorxiv.org/content/10.1...
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Andreas Brandmaier @brandmaier.bsky.social · 27/03/2025
Upcoming at #DAGStat2025 in Berlin at 5:20pm today: "Focus! SEM Trees and Forests for Identifying Moderators in Structural Equation Models" My slides are here: github.com/brandmaier/f...
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George Takei @georgetakei.bsky.social · 23/03/2025
This is what we’ve come to, and so quickly.
A screenshot of two news headlines. The first headline reads: "Britain Issues Travel Warning for US," with a publication date of Mar 20, 2025, at 10:16 AM EDT and an update at 10:53 AM EDT. The second headline reads: "Germany Issues Travel Warning for US," with a publication date of Mar 20, 2025, at 7:49 AM EDT and an update at 12:00 PM EDT. Both headlines are in bold black text, with the publication and update details in smaller red text below.
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Michèle Nuijten @michelenuijten.bsky.social · 20/03/2025
In the latest blog of the Meta-Research Center, I wonder if meta-scientists should hold themselves to higher standards. Do we lose credibility if we don't always follow all best practices we advocate for? #metascience #statcheck #psychscisky metaresearch.nl/blog/2025/3/...
metaresearch.nl
Should meta-scientists hold themselves to higher standards? — Meta-Research Center
This blogpost was written by Michèle Nuijten. Michèle is an assistant professor of our research group who currently studies reproducibility and replicability in psychology. She is also the developer o...
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Clément Canonne @ccanonne.github.io · 20/03/2025
If no single piece of the original ship remains in the current ship, is the ship still the Ship of Theseus? And if one percent of all my body's cells get replaced every single day, is it really me who, two months ago, accepted your review request?
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Ruben C. Arslan @ruben.the100.ci · 18/03/2025
New comment by @faridanvari.bsky.social and friends arguing that psychology is fragmented into the study of too many constructs and measures with too few links. www.nature.com/articles/s41...
nature.com
Defragmenting psychology
Nature Human Behaviour - Psychology is fragmented into the study of a myriad of constructs and measures, most of which are used very rarely. This hinders cumulative knowledge generation. We call on...
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Andreas Brandmaier @brandmaier.bsky.social · 17/03/2025
When you past self answered your question on stack overflow.
media.tenor.com
a young man is wearing sunglasses and the words `` too cool '' are written on the bottom .
ALT: a young man is wearing sunglasses and the words `` too cool '' are written on the bottom .
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Andreas Brandmaier @brandmaier.bsky.social · 12/03/2025
Looking for a R/reproducibility workshop in Berlin? Check "Reproducible Research in R: A Workshop on How to Do the Same Thing More Than Once" by Aaron Peikert in May. Register here: www.formr-uni-siegen.de/repro-worksh... #rstats
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Dirk Wulff @dirkwulff.bsky.social · 11/03/2025
How can we reduce conceptual clutter in the psychological sciences? @ruimata.bsky.social and I propose a solution based on a fine-tuned 🤖 LLM (bit.ly/mpnet-pers) and test it for 🎭 personality psychology. The paper is finally out in @natrevpsych.bsky.social: go.nature.com/4bEaaja
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Andreas Brandmaier @brandmaier.bsky.social · 11/03/2025
Please apply and work with Rogier!
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Caspar van Lissa 🟥 @cjvanlissa.bsky.social · 10/03/2025
To be FAIR: Theory needs an update! FAIR theory can be shared, reused in analysis software, and updated based on new findings. Using existing #openscience infrastructure, it streamlines collaboration, reduces research waste, and accelerates cumulative knowledge development osf.io/preprints/ps...
osf.io
OSF
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Caspar van Lissa 🟥 @cjvanlissa.bsky.social · 06/03/2025
Revising papers became easy when I discovered James Conigrave's "revise" package, which inserts tagged snippets from a manuscript into a revision letter! No more back-and-forth, no more consistency checking. Now on CRAN, may it save you as much time as it did me! cran.r-project.org/web/packages...
cran.r-project.org
revise: Dynamic Revision Letters for 'Rmarkdown' Manuscripts
Extracts tagged text from markdown manuscripts for inclusion in dynamically generated revision letters. Provides an R markdown template based on papaja::revision_letter_pdf() with comment cross-refere...
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Dan Quintana @dsquintana.bsky.social · 05/03/2025
Haha that's a new one
A screenshot of the following:

Dear Dr. Daniel Squintana,
Start each day with a grateful heart.
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