수직적 동등화 결과 비교·분석 연구 - 단계형 수준별 교과(수학)에서 -

Vertical equating, one of linking methods that are used to make test scores on different testing conditions comparable, is suitable for linking scores from different grades or levels. Vertical equating would be proper evaluation method for mathematics for curriculum differentiation in the 7th national curriculum.

In this study, a conception of linking and vertical equating was given and characteristics of common items were shown. Results of four vertical equatings were compared, characteristics of common items were analyzed, items showing differential item functioning were found, and item contents were studied.

Followings were found: difficulty for lower level test not be too high, common items be more difficult to lower level students than to higher level ones, difficulties and discriminations for common items be similar to those for uncommon items, the Tucker equating method is robust to characteristics of common items, and common items not show differ ential item functioning.