“…The Rasch model has been extensively applied in many fields, including high stakes professional examinations, such as the Physician Assistant National Certifying Exam. 15,16,28 In this study, the Rasch-Andrich rating scale model was used, 29 given that all the items were on the same rating scale. Rating scale category functioning, item-measure correlations, fit statistics, and person and item reliability were examined (see Table 2 for definitions of these and other Rasch terms), and the instrument was further refined based on the obtained results.…”