The multilevel extension to RoBMA was just published in BRM (link.springer.com/article/10.3...). Together with @maxmaier.bsky.social and EJ Wagenmakers, we developed a 3-level version of RoBMA which allows analysts to adjust for publication bias in meta-analyses with estimates nested within studies.

📰 | Das Aus für die Homöopathie auf Kassenkosten scheint jetzt beschlossene Sache zu sein Das Bundeskabinett hat die Krankenkassenreform beschlossen. Das heißt: Die GKV darf auch frewillig keine Globuli mehr erstatten. Der Gesetzentwurf soll vor der Sommerpause vom Bundestag beschlossen werden.

Follow @mathpsych.bsky.social for updates from the Journal of Mathematical Psychology!

🚨NEW PREPRINT🚨 together with Jürgen Huber & Michael Kirchler: “Massaging Significance in the Age of Open Science: A Satirical Tutorial,” which is a public service for anyone unwilling to let inconvenient data get in the way of a compelling narrative. 😉 Link to preprint: osf.io/preprints/ps...

'Vlam is een fan van Donald Trump. Of nou ja, uitgesproken fans zie je nauwelijks in de media, het zijn eerder apologeten. Journalist David Frum omschreef het in 2019 mooi, na racistische uitspraken van Trump: „Als dit allemaal voorbij is, zal niemand toegeven het ooit gesteund te hebben.”'

This is such a strong comment, published in 2022. It has 14 Google Scholar citations. The replicated paper has 65 citations in 2025 alone - and counting. www.aeaweb.org/articles?id=...

@www.sjamadriaan.nl vat de fophef over de schijf van vijf weer goed samen in deze column in @trouw.nl. De toon is net zo scherp als de inhoud. www.trouw.nl/opinie/de-sc...

A transcedental dance with twists and turns. How we used LLMs to prove a really awesome mathematical result, and how the LLMs then pointed out that the work had already been done, and better :-) Post: www.bayesianspectacles.org/a-transcende... Appendix: osf.io/nwg2v/files/...

The 2025 JASP Contributor Award Goes to Mátyás Bukva, for his implementation of the Plot Builder (based on the tidyplots package from Jan Broder Engler). Congrats!! Blogpost: jasp-stats.org/2026/04/01/t...

Eerste van onze nieuwe columnist @www.sjamadriaan.nl "Een niet bepaald ‘inconvenient’ onderzoek" skepsis.nl/een-niet-bep...

I need someone to explain to me---very slowly---how if you *know* they're dual nationals...so you don't let them in...why...you won't let them in? When a foreign national *would* be let in on the same passport? This is insanity.

Now out: JASP 0.96! The major innovation is an online module library (inspired by CRAN for R), added in collaboration with the Netherlands eScience Center. Blog post: jasp-stats.org/2026/03/17/i...

Do you struggle with missing data in your statistical analyses? Come join our Summer School "Solving Missing Data Problems in R"! We will tell you when you can safely use complete case analysis, and when more dedicated strategies are required! utrechtsummerschool.nl/courses/data...

One weakness Bluesky has compared to Threads is that we simply don’t have as many massive idiots making stupid posts generating screenshot-worthy replies

Awesome YouTube tutorial by Johnny van Doorn, "Theory and Practice of Bayesian Inference Using JASP". Link to the video: www.youtube.com/watch?v=VhIm... Blogpost: www.bayesianspectacles.org/youtube-lect...

Interested in finding out more about @jaspstats.bsky.social? The Psych Methods Group at the University of Amsterdam is running four hands-on workshops (in person or online) this summer (@ejwagenmakers.bsky.social, @fbartos.bsky.social). More information at jasp-stats.org/workshops/ but to sum up:

26 participants, 17 new modules...the JASP hackathon was a success and we're looking into making it an annual event! jasp-stats.org/2026/02/24/r...

Do not go to the USA.

On 16 and 17 February, the #JASP team organised a #hackathon where 27 participants from 6 countries learned how to contribute to their own modules to the JASP ecosystem! Special thanks to @ejwagenmakers.bsky.social, @pabrod.bsky.social, Stefan Verhoeven & Zowi Mens for making the event a success!

vazul: An R Package for Analysis Blinding: https://osf.io/mp54s

New: "Effect of Artificial Intelligence on Learning: A Meta-Meta-Analysis" by Wagenmakers and colleagues revealing evidence for "severe publication bias and extreme between-study heterogeneity" in existing meta-analyses of the effects of AI on learning: osf.io/preprints/ps...

I hate this: "The Editors have retracted this article... the Mini-Mental State Examination (MMSE) instrument was used without proper permissions" link.springer.com/article/10.1... The MMSE is a series of 11 simple questions. A perfectly good paper is retracted because you can copyright 11 questions

"Discovering Statistics Using JASP", the first of four summer workshops, is now open for registration. Join Johnny van Doorn and myself in sunny (well, we can hope) Amsterdam or online! jasp-stats.org/2026/02/03/h...

Bayesian Thinking for Toddlers -- now as a cartoon, courtesy of @viktorbeekman.bsky.social You can read the cartoon at www.bayesianspectacles.org/bayesian-thi...

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/...

New preprint by @semihaktepe.bsky.social 🎉 We compare ANOVA/SDT/GLMM for binary judgments in 20 datasets of the truth effect. #lme4 Main conclusion: "GLMMs are a theoretically sound and practically robust method and thus superior for analyzing binary judgments in social and cognitive psychology.”

#ICYMI: The seats for the Build Your Own #JASP Module #hackathon are quickly running out. It is not only free, we are even offering travel grants! Want to join us in Amsterdam on 16 and 17 February? Register here ➡️ jasp-stats.org/2026/01/27/a...

Does it mean that AI/LLMs do not help at education? I personally don't think so. I'm using the AI every day and find it incredibly useful. It would be odd if they didn't help at learning at all. However, the current empirical base does not substantiate strong claims.

We just posted a preprint with a comprehensive meta-meta-analysis of the effects of AI/LLMs on learning. TLDR: - 1,840 effect sizes - extreme between-study heterogeneity - extreme publication bias - small average effects (three times lower than usually reported) (osf.io/preprints/ps...)

Ancient Greek silver stater (coin) with an octopus on the reverse side. 🐙 Minted in Eretria, Euboea, Greece, 500-480 BC. Photo: British Museum www.britishmuseum.org/collection/o... #Archaeology #ReliefWednesday

Ten new JASP modules -- or perhaps more? The JASP Hackathon will take place Feb 16-17 at the eScience center in Amsterdam. This is our last call for applications. Teams are welcome; support to offset travel costs is available. jasp-stats.org/2026/01/27/a...

Are you interested in adding Bayesian analyses to your next project so you can finally start interpreting your null results? Then join us tomorrow where Dr. Johnny van Doorn from @jaspstats.bsky.social will give a workshop how easy Bayesian stats can be using JASP! Sign up below!

One court decision, two different headlines. Guardian on the left, NY Times on the right. Which one more directly conveys information and the stakes to the reader?

I love my profession deeply, but some of them are not covering themselves in glory these days. If a mob boss draws a sharp blade languidly across your palm and says it would be a real shame for you to lose your pinky, your headline isn't "Godfather rules out hacking off finger to settle debt."

Edgeworth proposed the alpha=.005 criterion 134 years prior to Benjamin et al. (2019). :-) www.bayesianspectacles.org/redefine-sta...

FDA drugs and biologics guidance for Bayesian clinical trials is something I've been dreaming of for decades. I am thrilled that this draft has been released!! #Statistics #StatsSky #fda #clinicaltrial #bayes

New candidate for re-analyses in JRR! Check out our new blog post where we highlight a study on support of global redistributive climate policies as a potential candidate for a set of robustness reports. Link: www.journalofrobustnessreports.org/majority-sup...

New episode of my favorite podcast! I had a great discussion with @itaiyanai.bsky.social and @martinlercher.bsky.social about (radical) exploration in science :)

This was really fun to write with @patrickbissett.bsky.social - Always great when you can give back to the folks who helped you get where you are.

With some trepidation, I'm putting this out into the world: gershmanlab.com/textbook.html It's a textbook called Computational Foundations of Cognitive Neuroscience, which I wrote for my class. My hope is that this will be a living document, continuously improved as I get feedback.

The world's earliest recorded outlier? Let me know if you have an even older example! www.jasp-services.com/jasp-for-qua...

AMPPS recently accepted a new paper "Registered Replication Report: Johns, Schmader, & Martens (2005)" on stereotype threat (osf.io/preprints/ps...); full paper is forthcoming on our website). AMPPS is now soliciting Commentary articles on this paper. @psychscience.bsky.social /cont

🔥 First Keynote and Program committe for StanCon 2026 🔥 We present Anna Dreber (Stockholm School of Economics) as the first keynote speaker More information can be found here:

How to donate to JASP (tax-deductable from the US) jasp-stats.org/2025/12/19/j...

How to donate to JASP (tax-deductable from the US) jasp-stats.org/2025/12/19/j...

I've used Lavaan almost every (work)day for 15 years, but this open source labour of love has never received proper institutional support. I'm delighted to be a small part of an 1.5M OpenScienceNL award, led by Jorgensen, to completely revamp and futureproof Lavaan www.openscience.nl/en/news/45-p...

I recently bought 20 bags of potato that, according to the Albert Heijn supermarket, should each contain 1 kg. This turns out to be *false*. www.jasp-services.com/at-the-alber...

Six journals rejected their commentary. Six! Journal system is really lousy in facilitating proper scientific process. @ploederl.bsky.social Diamond OA journal @robustnessreports.bsky.social would be a perfect fit. But I can see why you tried psychiatry journals to reach the audience. Catch22.

If you do what you did, you get what you got. (Meme van Marten Mantel voor Vrij Nederland)