Maarten Marsman

Ben jij gedreven om psychische klachten te voorkomen voordat ze beginnen of terugkeren? Dan is dit promotietraject iets voor jou!

Shift Left @Arkin @amsterdamumc.bsky.social

lnkd.in/di4vWujy
@uvapsychology.bsky.social

"So EJ, say I am tossing a coin..."

Hello world! We are a new company that provides support for organizations and industries who use the JASP open-source stats program. Check out our website www.jasp-services.com and our first blog post www.jasp-services.com/first-post/
Know companies using commercial stats software? Share this info!🙂

🚨 New preprint: A Stochastic Block Prior for Clustering in Graphical Models

We introduce an SBM prior to detect/test clusters in Bayesian network models for binary & ordinal data. Includes R code & tutorial.

📄 osf.io/preprints/ps...
📚 Blog: www.nikolasekulovski.com/blog/post2/

I am looking forward to expanding the scope of my professorship by combining cognitive and statistical modeling with LLMs😊

There will be two job openings for postdoc positions soon - one starting in September 2025 and another one a year later.

Home - Network Psychometrics: theory, methods and applications Network Psychometrics: Theory, Methods and Applications 4-8 August 2025   Join us to explore the forefront of psychological research! Network Psychometrics has rapidly gained prominence across various...

I am excited to teach at the Summer School on Network Psychometrics this August in Como, Italy! Theory, methods, and hands-on R for analyzing cross-sectional and longitudinal data. Full information and application (deadline April 24th): ntps.lakecomoschool.org

An introduction to Sequential Monte Carlo for Bayesian inference and model comparison—with examples for psychology and behavioral science - Behavior Research Methods Bayesian inference is becoming an increasingly popular framework for statistics in the behavioral sciences. However, its application is hampered by its computational intractability – almost all Bayesi...

My tutorial on Sequentual Monte Carlo for psychology and behavioural science is out now in Behavior Research Methods! Check it out at link.springer.com/article/10.3...

I could collect more data, and the Bayesian approach allows me to monitor the evidence (e.g., the BF) as the data come in. I could also include theory or results from earlier research and update my knowledge. This is the kind of cumulative science I like to see! :-)

The phrase about results "not providing a solid basis for cumulative science" is about edges with anecdotal evidence. If I do not have enough evidence to draw a conclusion about an edge, then any decision is "risky". I would be happy to learn this if my theory or intervention builds on the edge.

Interestingly, we also found evidence for the absence of many edges, a result that doesn't match the predictions of the unidimensional factor model, suggesting it wouldn't fit the data well. Thus, we likely need network or equivalently higher-order factor models to describe these data!

Hi Miri, I don’t think it’s about partial correlations but about model complexity, as Karoline said. Unidimensional factor models are also based on partial correlations and are often robust, but they also have far less parameters than network models.

Are psychometric networks sufficiently supported by data such that one can be confident when interpreting its results? We analysed 294 psychometric networks from 126 papers with the Bayesian approach to address this question @jmbh.bsky.social Sara Ruth van Holst @maartenmarsman.bsky.social 🧵

Emotions are reactions to situations we encounter in daily life. In our new paper in Psych Review (psycnet.apa.org/fulltext/202...; with @oisinryan.bsky.social and @fdabl.bsky.social), we take a first step towards building a generative model for emotion dynamics based on this simple principle 1/4

Je was me net voor!

This is a collaborative effort with amazing colleagues: Lourens Waldorp, Nikola Sekulovski, and @jmbh.bsky.social. 🙌 Thanks to this team for their hard work in advancing Bayesian methods in network analysis!

bgms: Bayesian Analysis of Networks of Binary and/or Ordinal Variables Bayesian variable selection methods for analyzing the structure of a Markov Random Field model for a network of binary and/or ordinal variables. Details of the implemented methods can be found in: Mar...

Ready to try it out? 🚀 Our method is implemented in R package bgms. Install it now and start analyzing your networks with Bayesian advantages! 🔗

cran.r-project.org/package=bgms

Why is this exciting? 🌟 Our Bayes factor test helps you distinguish the absence of evidence from the evidence of absence of a difference effect. 📊 This means you can actually quantify the support for the null hypothesis of parameter equivalence! 🎯

In this new work, we extend the ordinal Markov random field to compare two independent groups, modeling differences in category thresholds and pairwise interactions. We develop Bayes factor tests to contrast hypotheses of parameter differences and parameter equivalence. 📊

What’s the ordinal Markov random field? 🤔 It’s a network model for binary and ordinal variables, like the Gaussian graphical model handles continuous data, and the Ising graphical model handles binary data. Read our earlier pre-print for more info: psyarxiv.com/ukwrf

🚨 New pre-print alert! 🚨

We introduce a Bayesian independent samples t test for comparing networks of binary and ordinal Variables.

Curious why that matters for your next network analysis? 🧵

osf.io/preprints/os...

Do you need educational and psychological item response data to do your research? The IRW has 600 item response datasets (more coming!), distributed in a standardized format and ready for analysis.

Yes, please. :-)