대학수학능력시험 수리 영역 문항 난이도 예측을 위한 회귀모형 추정
Estimating the regression equations for predicting item difficulty of mathematics in the College Scholastic Ability Test
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Abstract
The purpose of this study is to identify the item characteristics that are supposed to affect item difficulty and to estimate the regression equations for predicting item difficulty of mathematics in the College Scholastic Ability Test(CSAT). We selected six variables related to item characteristics based on learning theories: contents, cognitive domain, novelty, item type, number of concepts, and the amount of computation. With data of the CSAT mathematics test administered in 2004-2006, item difficulty was regressed on the six variables, the location of an item, and the item writer's judgment on difficulty. The novelty of an item was found to be a statistically insignificant variable in explaining item difficulty. Four regression equations with different sets of independent variables could explain 70%～80% of the item difficulty variance and were validated as predicting item difficulty of the mock CSAT in 2006.
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