01663nas a2200133   4500008004100000020001400041245010900055210006900164300000900233490000700242520114500249100001201394856012301406       2005                        eng d  a0146-621600aTrait parameter recovery using multidimensional computerized adaptive testing in reading and mathematics0 aTrait parameter recovery using multidimensional computerized ada  a3-250 v293 aUnder a multidimensional item response theory (MIRT) computerized adaptive testing (CAT) testing scenario, a trait estimate (θ) in onedimension will provide clues for subsequentlyseeking a solution in other dimensions. Thisfeature may enhance the efficiency of MIRT CAT’s item selection and its scoring algorithms compared with its counterpart, the unidimensional CAT (UCAT). The present study used existing Reading and Math test data to generate simulated item parameters. A confirmatory item factor analysis model was applied to the data using NOHARM to produce interpretable MIRT item parameters. Results showed that MIRT CAT, conditional on theconstraints, was quite capable of producing accurate estimates on both measures. Compared with UCAT, MIRT CAT slightly increased the accuracy of both trait estimates, especially for the low-level or high-level trait examinees in both measures, and reduced the rate of unused items in the item pool. Index terms: computerized adaptive testing (CAT), item response theory (IRT), dimensionality, 0-1 linear programming, constraints, item exposure, reading assessment, mathematics assessment. 1 aLi, Y H  uhttp://www.iacat.org/content/trait-parameter-recovery-using-multidimensional-computerized-adaptive-testing-reading-and