rogier kievit

Gather round, all those bayes curious, pragmatic, committed or indifferent, for an elegant and flexible way to approach reliability estimation using bayesian measurement models! All thoughts and ideas welcome

I've been an AE at AMPPS for almost 5 years so happy to answer any questions - It's a fantastic opportunity to help shape methodological innovation and dissemination (and get the first glimpse of exciting new work!)

A Practical Guide to Specifying Random Effects in Longitudinal Dyadic Multilevel Modeling - Kareena S. del Rosario, Tessa V. West, 2025 Analyzing over-time dyadic data can be challenging, particularly when using multilevel models with complex random-effect structures. In this tutorial, we discus...

Do you want to get serious about specifying your random-effect structures? This paper might be for you.. plus lots of good stuff about multilevel and dyadic modeling: doi.org/10.1177/2515...

Choosing to go by train/ferry to #Flux2025 I emitted SEVEN times less C02 compared to a plane trip.

Air travel is one of the largest contributors to the carbon footprint of research. Researchers, universities and conferences have the responsabilities to create more sustainable alternatives.

Global Collaboration to Capture Variability in Child Development - Levante Ensuring that children around the world can flourish is one of the most important goals of our time. Developmental science has made major strides in understanding how children grow, learn, and thrive ...

A first blogpost from the LEVANTE team, introducing our global project perspective.

A good intro if you're interested in learning more about cross-cultural developmental data collection using LEVANTE.

levante-network.org/global-colla...

happy to share if you send me your current email. Main thing to know is the B1/B2 distinction and that you have to finish both. Two schools of thought are to finish the detailed B2 and compress to B1, or finish the big picture B1 and expand. I prefer the former (the details affect the big picture).

Abstract of the paper.

Title page of the paper.

The Item Response Warehouse is a new data resource for psychometricians interested in developing methods using bigger and more diverse sets of instruments: itemresponsewarehouse.org

New paper out now at BRM: doi.org/10.3758/s134...

Abstract: Under the banner of progress, products have been uncritically adopted or even imposed on users — in past centuries with tobacco and combustion engines, and in the 21st with social media. For these collective blunders, we now regret our involvement or apathy as scientists, and society struggles to put the genie back in the bottle. Currently, we are similarly entangled with artificial intelligence (AI) technology. For example, software updates are rolled out seamlessly and non-consensually, Microsoft Office is bundled with chatbots, and we, our students, and our employers have had no say, as it is not considered a valid position to reject AI technologies in our teaching and research. This is why in June 2025, we co-authored an Open Letter calling on our employers to reverse and rethink their stance on uncritically adopting AI technologies. In this position piece, we expound on why universities must take their role seriously toa) counter the technology industry’s marketing, hype, and harm; and to b) safeguard higher education, critical thinking, expertise, academic freedom, and scientific integrity. We include pointers to relevant work to further inform our colleagues.

Figure 1. A cartoon set theoretic view on various terms (see Table 1) used when discussing the superset AI (black outline, hatched background): LLMs are in orange; ANNs are in magenta; generative models are in blue; and finally, chatbots are in green. Where these intersect, the colours reflect that, e.g. generative adversarial network (GAN) and Boltzmann machine (BM) models are in the purple subset because they are both generative and ANNs. In the case of proprietary closed source models, e.g. OpenAI’s ChatGPT and Apple’s Siri, we cannot verify their implementation and so academics can only make educated guesses (cf. Dingemanse 2025). Undefined terms used above: BERT (Devlin et al. 2019); AlexNet (Krizhevsky et al. 2017); A.L.I.C.E. (Wallace 2009); ELIZA (Weizenbaum 1966); Jabberwacky (Twist 2003); linear discriminant analysis (LDA); quadratic discriminant analysis (QDA).

Table 1. Below some of the typical terminological disarray is untangled. Importantly, none of these terms are orthogonal nor do they exclusively pick out the types of products we may wish to critique or proscribe.

Protecting the Ecosystem of Human Knowledge: Five Principles

Finally! 🤩 Our position piece: Against the Uncritical Adoption of 'AI' Technologies in Academia:
doi.org/10.5281/zeno...

We unpick the tech industry’s marketing, hype, & harm; and we argue for safeguarding higher education, critical
thinking, expertise, academic freedom, & scientific integrity.
1/n

Very jealous following the FLUX conferences from afar - If you are attending, don't miss @jordyvanlangen.bsky.social's poster (F65) on our CODEC project later today! And of course, tomorrow morning a double act by @leacmichel.bsky.social

It's a real pleasure to be able to work with Léa - Not just a stellar scientist, but one with a.much bigger and broader view of what academia could and should be. If you're at flux this week, don't miss her talk Saturday morning and poster S52!

Figure 2 from the linked article.

Abstract of the linked article

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

🧵👇

A statement by Doctors Against Genocide which reads: To all international humanitarian organizations, The situation in Gaza is spiraling beyond any medical or moral threshold. The limited stock of intravenous fluids in our hospitals is no longer sufficient to treat the waves of starving individuals arriving at emergency units — from infants to the elderly, they are collapsing from pure exhaustion and hunger. This is no longer just a humanitarian crisis. It is a deliberate, systematic starvation of an entire population. We urge you — Speak. Act. Intervene. Nasser Medical Complex

“a deliberate, systematic starvation of an entire population”

A statement by Doctors Against Genocide.

#Gaza

Israeli fire mows down starving Palestinians in Gaza as hunger deaths surge UN says starvation in Gaza is man-made as families in the besieged territory endure ‘catastrophic hunger’.

UN says starvation in Gaza is man-made as families in the besieged territory endure ‘catastrophic hunger’.

‘Tremendous uncertainty’ for cancer research as US officials target mRNA vaccines Amid Trump cuts and state-level backlash, experts worry that progress in messenger RNA vaccines could stall

Over 120 mRNA cancer trials are now at risk as the Trump admin cuts funding & tells researchers to scrub “mRNA” from grant proposals.

What started as COVID fearmongering is now derailing life-saving cancer research.

Hope remains - but scientists say time is running out.


zurl.co/YBGNy

'ggplothko' #aRt

Just 3 days left until this workshop, so don't miss your chance to register!
Details: bit.ly/3wBeY4S
Please share!
#AcademicSky #EconSky #RStats

A quoted movie review about pearl harbour '“Pearl Harbor” is a two-hour movie squeezed into three hours, about how on Dec. 7, 1941, the Japanese staged a surprise attack on an American love triangle. Its centerpiece is 40 minutes of redundant special effects, surrounded by a love story of stunning banality. The film has been directed without grace, vision, or originality, and although you may walk out quoting lines of dialog, it will not be because you admire them.'

My favourite Ebert sentence for a 1.5 star review: "Pearl Harbor is a two-hour movie squeezed into three hours". This opening paragraph should be framed.

I thought ponies were baby horses until I was about 28. Years, not months.

Especially when some (e.g. NPJ aging) take a month to do so!

Unsung observatory worker was UK’s first professional female astronomer, experts say Cambridge’s Institute of Astronomy is trying to find a photo of Annie Walker, who died in 1940, to give her star billing

'researchers...say that Annie Walker – a Victorian woman who began working at the observatory in 1879, when she was only 15 – ...observed thousands of stars herself....Walker was the first British professional female astronomer...paid a living wage by an observatory in the UK to chart the stars.'

(and of course, it's a preprint so it matters much less, and it will find a home in a good journal. But having 'positive' and 'negative' findings published in non-overlapping journals is a great way to generate zombie findings)

New paper by @njudd.com shows that an additional year of education doesn't causally affect telomere length in old age, despite many (theory) accounts arguing otherwise. It's been desk rejected by 13 journals happy to publish small 'positive' telomere studies. Sigh. www.biorxiv.org/content/10.1...

Picked up my poster for #ESCAP2025 last week and had a small surprise arriving at the Airbnb..

If you want to see my real poster on the association between adversity and grey and white matter development, come meet me at D2.102 today!

In Control A Manifesto for a Responsible Digital Future in Higher Education - De Jonge Akademie Publications

www.dejongeakademie.nl/en/publicati...

Big tech is threatening our autonomy and academic freedom, don't let it!

Cover of the textbook used in the workshop

✨We are organising (again) an online workshop on Theoretical Modeling for PhD candidates and Master students in cognitive science and psychology. Check out the website and the schedule: Registration is open! (closes July 1, spaces are limited) 🧵1/n computationalcognitivescience.github.io/workshop/

Constructing language: a framework for explaining acquisition Explaining how children build a language system is a central goal of research in language acquisition, with broad implications for language evolution, adult language processing, and artificial intelli...

Children are incredible language learning machines. But how do they do it? Our latest paper, just published in TICS, synthesizes decades of evidence to propose four components that must be built into any theory of how children learn language. 1/
www.cell.com/trends/cogni... @mpi-nl.bsky.social

Data sharing practices and data availability upon request differ across scientific disciplines - Scientific Data Scientific Data - Data sharing practices and data availability upon request differ across scientific disciplines

cf. www.nature.com/articles/s41... 'We observed that statements of data availability upon (reasonable) request are inefficient and should not be allowed by journals.'

Very pleased to welcome new postdoc Dr Lucia Hernandez Pena @luciahp96.bsky.social to our lab.
Lucia will be working on our new longitudinal study on microstructure brain development and its relation to cognition and mental health in adolescence, with a large team of collabs at Cardiff and Donders

Balloon wall art inspired by the ggplot2 hex sticker. The display features a hexagonal frame made of black balloons, filled with white balloons inside and surrounded by a background of light and dark blue balloons. A line graph with black balloon segments and round coloured nodes runs across the centre, and the word “ggplot2” is spelled out in black balloon letters below the chart.

Happy 18th birthday ggplot2! #rstats