Tutorials and worked examples in R.
Computerised adaptive testing with EAP scoring, rebuilt step by step in base R for six IRT models and checked against catR.
Worked examples in R: decision trees, LDA, regularized regression, Keras, measurement invariance, multitrait-multimethod, Thurstonian IRT, adaptive testing and statistical paradoxes.
Data visualisation in R with real data: Arctic sea ice, global temperature, airport weather, Gapminder, EU wages, colour charts and optical illusions.
Psychometric validation of personality questionnaires in R: item statistics, reliability, correlations and factor structure for the BFI-44 and the IPIP-50 (OCEAN).