About Me

I am an Assistant Professor in the Psychological Methods department at the University of Amsterdam. My research focuses on Bayesian inference in psychological science — in particular hypothesis tests for rank-based data and mixed models — with broader interests in open science and software development for JASP.

Books

Together with Andy Field and Eric-Jan Wagenmakers, I co-authored Discovering Statistics Using JASP, a comprehensive introduction to statistics using the free, open-source software JASP. All companion materials — including exercises, data files, and screencasts — are freely available at discoverjasp.com.

I also wrote A Brief Introduction to Bayesian Inference, a short online booklet introducing the core ideas behind Bayesian statistics. It is freely available at johnnydoorn.github.io/IntroductionBayesianInference.

Teaching

I teach undergraduate statistics courses at the University of Amsterdam, including Research Methods & Statistics and Scientific & Statistical Reasoning. I also develop materials for various statistics workshops. All my teaching materials are openly available in my teaching-statistics GitHub repository.

Software

I am a contributor to JASP, a free and open-source statistics program that makes Bayesian and frequentist analyses accessible through an intuitive graphical interface.