Determining a correct response to many test
items frequently requires more than one ability.
This paper describes the characteristics of items of
this type by proposing generalizations of the item
response theory concepts of discrimination and
information. The conceptual framework for these
statistics is presented, and the formulas for the
statistics are derived for the multidimensional
extension of the two-parameter logistic model. Use
of the statistics is demonstrated for a form of the
ACT Mathematics Usage Test. Index terms: item
discrimination, item information, item response
theory, multidimensional item response theory.
Reckase, Mark D & McKinley, Robert L. (1991). The discriminating power of items that measure more than one dimension. Applied Psychological Measurement, 15, 361-373. doi:10.1177/014662169101500407
Reckase, Mark D.; McKinley, Robert L..
The discriminating power of items that measure more than one dimension.
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