Research themes include:
- foundations of educational research
- intelligence
- nonparametric item response theory
- interrater reliability
- computer adaptive testing
- measurement invariance
- meta-analysis
- longitudinal data analysis
- (non-standard) structural equations modelling
- social networks, and
- learning analytics
As of November 2020, the methods and statistics research group have two VENI laureates, and one Open-Competition laureate.