In many testing programs it is assumed that the context or position in which an item is administered does not have a differential effect on examinee responses to the item. Violations of this assumption may bias item response theory estimates of item and person parameters. This study examines the potentially biasing effects of item position. A…

Investigated how well the generalized and Rasch models described item and test performance across a broad range of mixed-item-format test configurations (six tests from two state proficiency testing programs). Evaluating the impact of model assumptions on the predictions of item and test information permitted a delineation of the implications of…

Created a developmental scale for the North Carolina End-of-Grade Mathematics Tests using a subset of identical test forms administered to adjacent grade levels with Thurstone scaling and Item Response Theory methods. Discusses differences in patterns produced. (Author/SLD)