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Item Analysis of K-WAIS Standardization Data

Abstract

Item analysis has been done on 10 Wechsler subscales using standardization data of korean version of the WAIS-R. Items in the information subtest showed relatively high item-total correlations, but they lack of some difficult items. The Picture Completion and Digit Span subtest turned out to have comparatively high item-total correlations, a wide range of difficulty level and high internal consistency. Items of Picture Arrangement showed favorable item-total correlations, cover a large range of difficulty level, and the reliability of the newly constructed items was also satisfying. Items of the Comprehension subtest were highly reliable and consistent in spite of the fact that the number of items were reduced. The subscale Block Design and Arithmetic also showed high item-total correlations, a wide range of difficulty level and high internal consistency. Item analysis of Object Assembly subtest revealed that they are composed of relatively easy items and therefore might have some difficulty in discriminating high intelligence group. Items in the Comprehension and Similarity subtest showed high item-total correlations, a wide range of difficulty level and high internal consistency, but the item difficulty indices of the scale Similarity don`t quire correspond to the order in which the items are presented.

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