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Investigating Item Difficulty Change By Item Positions Under The Rasch Model, Luc T. Le, Van Nguyen
Investigating Item Difficulty Change By Item Positions Under The Rasch Model, Luc T. Le, Van Nguyen
Dr Luc Tu Le
In operational testing programs using item response theory (IRT), item parameter invariance is one of essential requirements in common item equating designs. However, in practice, the stability of item parameters can be affected by many factors. Particularly, this study utilised data from the large-scale Graduate Skills Assessment (GSA) in 2010 to investigate the change of Rasch item difficulty by item positions. The test included 78 multiple-choice items and was presented in eight test forms by arranging the items in different orders. Items addressed three components of generic skills: Critical Thinking, Problem Solving and Interpersonal Understandings. Each test form was randomly …