Unmotivated students do not reap the full rewards of using a computer-based intelligent tutoring system. Detection of improper behavior is thus an important component of an online student model. To meet this challenge, we present a dynamic mixture model based on Item Response Theory. This model, which simultaneously estimates a student’s proficiency and changing motivation level, was tested wit...

We conducted a study of 400 preschool children to determine whether spatial and numerical skills rely on common processes. Children completed a battery of mathematical tasks as part of an ongoing preschool formative assessment development project. We created theoretically meaningful skills from these tasks and carried out item response theoretic analyses on each skill. We extracted Rasch scores...

This paper shows the impact of differential discrimination on the results of vertical equating when the Rasch model is applied. It is shown that where there is differential discrimination, relevant items contribute information, for the purpose of vertical equating, that contains systematic error. The impact of differential item discrimination on vertical equating is examined from a theoretical ...

This study investigates differences in the partial scoring performance of examinees in elimination testing and conventional dichotomous scoring of multiple-choice tests implemented on a computer-based system. Elimination testing that uses the same set of multiple-choice items rewards examinees with partial knowledge over those who are simply guessing. This study provides a computer-based test a...