Rasch common-item equating is often used in high-stakes testing to maintain equivalent passing standards across test administrations. If unaddressed, item parameter drift poses a major threat to the accuracy of Rasch common-item equating. We compared the performance of well-established and newly developed drift detection methods in small and large…

Application of person-fit statistics to cognitive diagnosis requires special efforts to detect normal and usual response patterns resulting from sources of misconception that are frequently observed among students. This study shows a solution for the problem by introducing an extension of a person-fit statistic developed by K. Tatsuoka (1985).…