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Mathematics data from de Ayala (2009; pg. 14); 5 item dataset in table format.
Phil Chalmers rphilip.chalmers@gmail.com
de Ayala, R. J. (2009). The theory and practice of item response theory. Guilford Press.
if (FALSE) { dat <- expand.table(deAyala) head(dat) itemstats(dat) }
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