項目反応理論を用いた第1回共用試験医学系CBTの統計解析

仁田 善雄, 前川 眞一, 柳本 武美, 前田 忠彦, 吉田 素文, 奈良 信雄, 石田 達樹, 福島 統, 齋藤 宣彦, 福田 康一郎, 高久 史麿, 麻生 武志

doi:10.11307/mededjapan1970.36.3

Data from the first trial of the computer-based nationwide common achievement test in medicine, carried out from February through July in 2002, were analyzed to evaluate the applicability of the item-response theory. The trial test was designed to cover 6 areas of the core curriculum and included a total of 2791 items. For each area, 3 to 40 items were chosen randomly and administered to 5693 students in the fourth to sixth years; the responses of 5676 of these students were analyzed with specifically designed computer systems. Each student was presented with 100 items. The itemresponse patterns were analyzed with a 3-parameter logistic model (item discrimination, item difficulty, and guessing parameter). The main findings were: 1) Item difficulty and the percentage of correct answers were strongly correlated (r=-0.969to-0.982). 2) Item discrimination and the point-biserial correlation were moderately strongly correlated (r=0.304 to 0.511). 3) The estimated abilities and the percentage of correct answers were strongly correlated (r=0.810 to 0.945). 4) The mean ability increased with school year. 5) The correlation coefficients among the 6 curriculum area ability scores were less than 0.6. Because the nationwide common achievement test was designed to randomly present items to each student, the item-response theory can be used to adjust the differences among test sets. The first trial test was designed without considering the item-response theory, but the second trial test was administered with a design better suited for comparison. Results of an analysis of the second trial will be reported soon.

項目反応理論を用いた第1回共用試験医学系CBTの統計解析

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項目反応理論を用いた第1回共用試験医学系CBTの統計解析

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