retain aberrant anchor items. Three methods of detection were explored; (1) delta plot, (2) IRT b-parameter plots, and (3 … for eliminating the use of flagged items for linking assessments when a matrix-sampling design is used and a large number … of items are used within that anchor. While neither the delta nor the IRT b-parameter plot methods produced results that …

calibration with unidimensional IRT models, as well as to examine its robustness to various multidimensional test structures. In … unidimensionality since the performance of the concurrent calibration with the unidimensional IRT models declined significantly with the … notable and significant effects on the equating results appeared to be those due to the factor of group ability distributions …

An important advantage of item response theory (IRT) is increased flexibility for methods of test equating. Several …'s linking procedure. A recent development in IRT has been the introduction of Testlet Response Theory (TRT) models, in which … the scale linking procedures that are based on the 3-PL IRT model and the graded response model. An operational data …

study distinctive response time models incorporated in IRT were compared, and the relationship between item characteristics …