I am an Assistant Professor at Tilburg University. My research focuses on meta-science, including topics such as replication, publication bias, statistical errors, and questionable research practices.
I am part of the Meta-Research Center at Tilburg University: http://metaresearch.nl.
Work phone: (+31) (0) 13 466 2053
Yesterday I was awarded the Tilburg University Dissertation Prize. It is a great honor, but I’m especially grateful because this as a sign that Tilburg University thinks it is good to be critical about the current scientific system, and that open science is an important step forward.
I would like to thank my advisors and collaborators, without whom this dissertation would not exist.
My full dissertation, “Research on Research: A Meta-Scientific Study of Problems and Solutions in Psychological Science”, can be downloaded here.
In a recent letter to the editor in the Chronicle, we reply to an earlier article that
presented the open science movement as “burning things to the ground”. We disagreed. We mainly see cooperative, constructive, and pragmatic initiatives to improve the state of psychological science.
Read the full letter here.
Chartier, C. R., Kline, M. E., McCarthy, R. J., Nuijten, M. B., Dunleavy, D. J., & Ledgerwood, A. A cooperative revolution in psychology. The Chronicle of Higher Education.
Our research group, the Meta-Research Center, is featured in a profile in Science Magazine. We talk about our work and our drives to improve psychological research. Read the whole piece here.
At the Solid Science Workshop in Bordeaux (September 6-7, 2018), I gave a workshop about free software to facilitate solid research practices. During this workshop, we collaboratively worked on a list of resources/software/tools that can be used to improve different stages of the research process.
Check out the list, share it with colleagues, or add your own resources to it here: https://bit.ly/opensciencesoftware.
The slides of the workshop can be found here: https://osf.io/s8wpz/.
I wrote an invited review for Developmental Medicine & Child Neurology about “Practical tools and strategies for researchers to increase replicability”.
Problems with replicability have been widely discussed over the last years, especially in psychology. By now, a lot of promising solutions have been proposed, but my sense is that researchers are sometimes a bit overwhelmed by all the possibilities.
My goal in this review was to make a list of some of the current recommendations that can be easily implemented. Not every solutions is always feasible for every project, so my advice is: copy best practices from other fields, see what works on a case-by-case basis, and improve your research step by step.
The preprint can be found here: https://psyarxiv.com/emyux.
Saturday June 30, I was interviewed about my dissertation for the Dutch radio show “Dr Kelder & Co”, for NPO Radio 1. The main takeaways: scientists are also just people, psychology is heading into the right direction, and trains don’t always do what you want.
Listen to the whole interview (in Dutch) here.
Wednesday May 30, 2018, I successfully defended my PhD thesis, which means that I can now finally call myself Dr. Nuijten!
I thank my promotors Jelte Wicherts and Marcel van Assen for all their advice over the last 5 years, and my committee – Chris Chambers, Eric-Jan Wagenmakers, Rolf Zwaan, and Marjan Bakker – for their interesting (and fun!) questions.
My full thesis “Research on research: A meta-scientific study of problems and solutions in psychological science” can be found here.
My dissertation is finished!
The cover: my own desk, feat. SIPS, BITSS, and COS. Cover design by Niels Bongers.
The contents: statcheck, data sharing, meta-analysis, power, bias, and more.
You can find the full thesis here:
Our new meta-meta-analysis on intelligence research is now online as a preprint at https://psyarxiv.com/ytsvw.
We analyzed 131 meta-analyses in intelligence research to investigate effect sizes, power, and patterns of bias. We find a typical effect of r = .26 and a median sample size of 60.
The median power seems low (see figure below), and we find evidence for small study effects, possibly indicating overestimated effects. We don’t find evidence for a US effect, decline or early-extremes effect, or citation bias.
Comments are very welcome and can be posted on the PubPeer page https://pubpeer.com/publications/9F209A983618EFF9EBED07FDC7A7AC.