Mathematics data from de Ayala (2009; pg. 14); 5 item dataset in table format.
Arguments
References
Chalmers, R., P. (2012). mirt: A Multidimensional Item Response Theory
Package for the R Environment. Journal of Statistical Software, 48(6), 1-29.
10.18637/jss.v048.i06
de Ayala, R. J. (2009). The theory and practice of item response theory. Guilford Press.