Our paper is now out in Hormones and Behaviour. We found little evidence for group differences in 2D:4D ratios by sexual orientation when jointly modeling publication bias and heterogeneity. w/ @fbartos.bsky.social, Ben Jones & @tvpollet.bsky.social www.sciencedirect.com/science/arti... 🧵1/9

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:

Everything is ready for the Perspectives on Scientific Error conference that starts tomorrow in Leiden! I look forward to hanging out with the mix of metascientists, philosophers of science, and statisticians! So many old friends will be there (and hopefully some new ones)! #PSE8

Come to Amsterdam or join online for the full week of JASP workshops (24th-28th of August)! If you can't do the full week or you are only interested in meta-analysis, I will be giving the Meta-Analysis workshop on 25th of August. jasp-stats.org/2026/02/05/h...

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...

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...)

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

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

"we did not find any evidence for publication bias (p=0.077)"

The Robust Bayesian Meta-Analysis package got updated with additional vignettes explaining how to perform Bayesian model-averaged publication bias-adjusted - multilevel meta-analysis (cran.r-project.org/web/packages...) - multilevel meta-regression (cran.r-project.org/web/packages...)

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...

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...

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...

We just preprinted a huge meta-meta-analysis examining the effects of exercise on cognition, memory, and executive function In short - 2239 effect sizes - extreme between-study heterogeneity - extensive publication bias - some subgroup/exercise-specific effects More below (doi.org/10.31234/osf...)

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...

New blogpost on our JRR website! Check out our new blogpost (link below): we highlight a study for re-analysis on whether CEOs are shaped by their daughters. This could be a potential candidate for a robustness report. www.journalofrobustnessreports.org/are-ceos-sha...

"Always plot your data" -- an example of using descriptives *before* measuring capability of an instrument. We intend to have regular posts demonstrating how JASP can be useful for quality control and lean six sigma. www.jasp-services.com/jasp-for-qua...

We just started a website highlighting articles that would make good candidates for a Robustness Report. 🌐 Check out the website: www.journalofrobustnessreports.org 📄 Read our first blog post: www.journalofrobustnessreports.org/inaugural-po...

We built the openESM database: ▶️60 openly available experience sampling datasets (16K+ participants, 740K+ obs.) in one place ▶️Harmonized (meta-)data, fully open-source software ▶️Filter & search all data, simply download via R/Python Find out more: 🌐 openesmdata.org 📝 doi.org/10.31234/osf...

Simulation studies have a conflict of interest problem. The same team: - develops a new method - designs a simulation study to evaluate it However, the new method has to show good performance to get published. We propose living synthetic benchmarks to address the issue (doi.org/10.48550/arX...).

New blog post! Why companies win by investing in open-source software. With zebra-painted cows, of course. www.jasp-services.com/why-companie...

We are pleased to have @fbartos.bsky.social join us today, Tuesday, September 30th, 11am (EST) to talk about Bayesian Hypothesis testing! This is followed by a workshop on using JASP for statistics around 12:10pm. The zoom is open to public with details in the flyer! @PsychPrinceton

Simonsohn has now posted a blog response to our recent paper about the poor statistical properties of the P curve. @clintin.bsky.social and I are finishing up a less-technical paper that will serve as a response. But I wanted to address a meta-issue *around* this that may clarify some things. 1/x

Sage created a 44-second promo video for our book "Discovering Statistics Using JASP". Blog post: jasp-stats.org/2025/09/24/d... The video itself: www.youtube.com/watch?v=MP0N...

Can anyone point me to the simulation studies showing that p-curve performs well under realistic conditions? And any done by someone else than pcurve authors? As far as I know, p-curve fails horrendously as long as any heterogeneity is involved... doi.org/10.1177/1745... doi.org/10.1002/jrsm...

We released two preprints describing the JASP Meta-Analytic functionality in detail. Meta-Analysis with JASP, Part I: Classical Approaches (arxiv.org/abs/2509.09845) Meta-Analysis with JASP, Part II: Bayesian Approaches (arxiv.org/abs/2509.09850)

Z-curve plot is a new visual model fit diagnostic for #metaanalysis with an emphasis on #publicationbias. In contrast to funnel plots, z-curve plots - visualize the distribution of z-statistics (where bias usually occurs) - compare the fit of multiple models simultaneously

New paper for anyone working with data: Better data viz - for free, in few clicks. Below, all N = 111, M = 0.04, SD = 0.27. One-sided t-tests vs. 0 yield: t(110) = 1.67, p = .049. Use raincloud plots. Or risk wrong conclusions! Plot w/ @jaspstats.bsky.social today! 🧪 📊 #PsychSciSky #StatsSky 🧵👇

Fair coins tend to land on the same side they started: evidence from 350,757 flips. That's the title of our paper summarizing ~650 hours of coin-tossing experimentation just published in the Journal of the American Statistical Association. doi.org/10.1080/0162...

It is a bit funny seing many people outraged about p-curve, after the well deserved critique by Moorey, but completely unfazed about the still dominant practice of using funnel plots and fail-safe n to claim absence of publication bias. With common defense "that’s how other studies did it before"...

Paper drop, for anyone interested in #metascience, #statistics, or #metaanalysis! @clintin.bsky.social and I show in a new paper in JASA that the P-curve, a popular forensic meta-analysis method, has deeply undesirable statistical properties. www.tandfonline.com/doi/full/10.... 1/?

I'm excited that our preregistration template for simulation studies is now available on OSF! See below for a brief interview with the Center for Open Science about the template and why we created it..

@fbartos.bsky.social @maxmaier.bsky.social‬ & EJ Wagenmakers have extended RoBMA with 3-level publication bias-adjusted model-averaged meta-regression models in R along with the usual code-free and intuitive @jaspstats.bsky.social implementation. Nerdy details are osf.io/preprints/ps...

The new version of JASP (0.95) containing another significant update to the Meta-Analysis module is out. You can perform state-of-the-art Bayesian publication bias-adjusted meta-regression in only a few clicks. A couple of additional clicks get you publication-ready figures!

We finally extended robust Bayesian meta-analysis to multilevel settings. Now, you can fit 3-level publication bias-adjusted model-averaged meta-regression models in R (and in about a week in @jaspstats.bsky.social too!)

Martin Hayden from LearnSixSigma.co.uk shares his experience of using JASP for quality control -- a free and open-source statistical software for which we offer enterprise-level services. Check it out, maybe you will switch to using @jaspstats.bsky.social too!

Big team effort & thx collaborators Led by @adamfinnemann.bsky.social w/@noraskjerdingstad.bsky.social, L. Speyer, @orestiszavlis.bsky.social, @fbartos.bsky.social, R. Wiers, Han van der Maas, Chris Sibley, Sverre Johnson, @mahelmich.bsky.social & A. Hoffart authors.elsevier.com/c/1lF9zbXYiy...

Just a reminder that #ESMARConf2025 is starting tomorrow! This is a free online conference about evidence synthesis and meta-analysis using #Rstats. Further details can be found here: esmarconf.org/2025/

I will teach my advanced #MetaAnalysis course this year (September 24-26, 2025): www.wvbauer.com/doku.php/cou... Since my regular meta-analysis course is also overdue, I decided to extend the advanced course by an extra day to cover the standard methods more thoroughly.

A recently published meta-analysis in Nature Human Behaviour "found evidence supporting the efficacy of social comparison as a behaviour change technique in shaping behaviour in the desired direction". I was curious, so I re-analyzed the manuscript, but the funnel plots below say it all.

We started a company to provide enterprise-level support for open-source statistical software @jaspstats.bsky.social . Our website with the mission and offers just went online! Is your business paying large licensing fees for statistical software? Are you looking for a change? Check it out!

🚀 PhD Position in Psychological Methods at @unimarburg.bsky.social 📅 Start: 01.10.2025 | 💼 50% TV-H E13 | ⏳ 3 years Focus on statistical modeling—Bayesian statistics, cognitive modeling, psychometrics. 🔗 Apply now: uni-marburg.de/r5dKTr 🔄 Thanks for sharing!

We are running the summer JASP workshops again this year. We offer both on-site/online participation, see more details at: jasp-stats.org/workshops/

Does ChatGPT help with students' learning performance, learning perception, and higher-order thinking? We re-analyzed a recently published meta-analysis and found that the original conclusion is almost entirely driven by publication bias.

Looking for recommendations to finish my #statistics #mugs collection!

The Journal of Robustness Reports is here. Diamond open access. A model for #openscience and #metascience. @balazsaczel.bsky.social scipost.org/JRobustRep.0... 🧪

We are live! Introducing the "Journal of Robustness Reports" – a Diamond Open-Access journal dedicated to publishing short reanalyses of empirical findings. Check out our website and blog post about the journal: 🌐 scipost.org/JRobustRep 📄 www.bayesianspectacles.org/introducing-...

Love the idea scipost.org/JRobustRep "We hope that the Journal of Robustness Reports will help make reanalyses of published findings the norm across the empirical sciences." #diamondOA scipost.org/JRobustRep/a... @fbartos.bsky.social @balazsaczel.bsky.social @ejwagenmakers.bsky.social

The upcoming version of @jaspstats.bsky.social is gonna feature an even better version of the meta-analysis module. For example, the forest plot will allow aggregating effect size estimate information with just a couple click!

Our meta-analysis on changes in oral contraceptive use and partnered women's sexual satisfaction is now published in Hormones and Behavior. w/ @juliastern.bsky.social, @fbartos.bsky.social, Yasaman Rafiee, @tvpollet.bsky.social, and Ben Jones. www.sciencedirect.com/science/arti...