This (unidimensional) dataset includes multiple-choice model item parameter estimates
for two groups. There are 60 items, all of which are common items. The estimates
are from the 1997 and 1998 ACT mathematics test. The item parameters were
obtained from the examples for the software
mceq written by Bradley
A list of length two. The matrices in the two list elements contain multiple-choice model item parameters for 1997 and 1998 respectively. The first six columns in each matrix are the slope parameters, the next six columns are the category difficulty parameters, and the last five columns are the lower asymptote parameters.
Kim, J.-S. & Hanson, B. A. (2002). Test Equating Under the Multiple-Choice Model. Applied Psychological Measurement, 26(3), 255-270.
The item parameters can be found here http://www.b-a-h.com/software/mcmequate/index.html
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