- An introduction to psychometric theory with applications in R, http://personality-project.org/r/book/
- A visual guide to item response theory, http://www.uni-jena.de/svw/metheval/irt/VisualIRT.pdf
- My favourite R package for: summarising data, https://dabblingwithdata.wordpress.com/2018/01/02/my-favourite-r-package-for-summarising-data/
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