Comparison of Two Logistic Multidimensional Item Response Theory Models
AMERICAN COLL TESTING PROGRAM IOWA CITY IA
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Test data generated according to two different multidimensional item response theory models were compared at both the item response level and the test score level to determine if measureable differences between the models could be detected when the data sets were constrained to be equivalent in terms of item p-values. Although differences could be detected at the item level, these differences decreased as the correlation between examinee abilities increased. Furthermore, these item differences were small in magnitude and could be considered unimportant or insignificant from a practical standpoint. No differences were found at the total test score level, and it was concluded that, at least for the data used in this study, the models were indistinguishable.