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)

Just had our first set of reviews from @pci-regreports.bsky.social for our proposed study on RT during GLP-1-RA treatment. Probably the most constructive and useful set of reviews I have ever had... and having them before starting the study makes them even better! 11/10 would recommend!

The suspense is building: do the measurements of 20 units indicate that the Albert Heijn underfills its 1 kg bags of potatoes? An interim post on the importance of articulating your predictions *before* seeing the results. :-) www.jasp-services.com/do-the-1kg-a...

Seven-parameter drift-diffusion pdfs and cdfs now in Stan statmodeling.stat.columbia.edu/2025/12/11/s...

SKULL OF THOMAS AQUINAS: TAKE A LEFT NOW PRIEST: No, the GPS says we have to keep going— SKULL: I KNOW A SHORTCUT PRIEST: Do you remember the last ti— SKULL: FOR THOSE WITH FAITH, NO EVIDENCE IS NECESSARY; FOR THOSE WITHOUT IT, NO EVIDENCE WILL SUFFICE

I'm teaching Statistical Rethinking again starting Jan 2026. This time with live lectures, divided into Beginner and Experienced sections. Will be a lot more work for me, but I hope much better for students. I will record lectures & all will be found at this link: github.com/rmcelreath/s...

So we bought 20 kg of Albert Heijn potatoes — not to eat, but to test whether the “1 kg” bags really weigh 1 kg. Setup is ready and measurement about to start. Results are coming next week! www.jasp-services.com/you-say-pota...

🇨🇦🇨🇦 Just announced: a massive new program from the Canadian govt, separate from the well-known CRCs and CERCs, to recruit foreign scientific talent Canada was already a destination for scientists but whoa. Real impressive for a new govt to back political talking points with serious investment

Proud of our article, “Bayesian Projection of Extant Refugee & Asylum Seeker Populations,” with Herb Susmann, just published in Demography.

The latest from an honored member of the Royal Society. Every week he attacks the foundations of society in the UK and the EU and @royalsociety.org is apparently too worried about retribution to do anything about it.

A preprint on "pessimistic and optimistic cognitive biases in cockroaches" www.biorxiv.org/content/10.6... A cockroach pessimist believes the trash can is half empty...

Check out our new blogpost with a potential candidate for Robustness Reports! We highlight a study on whether negative words increase online news consumption as a potential candidate for a set of robustness reports. Link: www.journalofrobustnessreports.org/does-negativ...

Preparing this talk gave me an opportunity to reflect on what lessons I've learned from psychology's replication crisis and credibility revolution, and what advice I would have for other fields. We've come a long way! Video: youtu.be/_vb1CNwC3CM?... Slides : osf.io/cuj62/files/...

The EEGManyPipelines Dataset: Metascientific Data on 168 Independent Analyses of a Single EEG Dataset: https://osf.io/c4xwg

This week's blog post features "raincloud plots", a relatively recent development in data visualization. Will the raincloud plot gradually replace the box plot? It just might! Check out the raincloud plot for the planets in our solar system at www.jasp-services.com/jasp-for-qua...

I think that the field needs to clean up the published literature a bit. Additional small studies are not going to move the needle at this point; maybe a couple of large-scale, pre-registered studies might provide more insight?

Starting in about two hours, I’ll be giving a zoom talk about what lessons other disciplines can take from Psychology’s replication crisis. Link to register: univ-cotedazur.zoom.us/meeting/regi...

How do I join

Polish meme translated into English.

The stuff you find when you actually read the RCTs in a systematic review... This paper is one of the foundational studies on vitamin D to prevent respiratory infections in kids. Cited 1,400 times as per Google Scholar.

“The articles in AMPPS offer, month in and month out, the invitation to practice aligning your values, intentions, and actions to do less scientific harm and reach for the methodological ceiling” Grateful to @dsbarra.bsky.social for continuing what @profsimons.bsky.social & co started at AMPPS!

Feb 16-17: JASP Hackathon in Amsterdam! Now open for applications Post with details on the JASP website: jasp-stats.org/2025/11/21/a...