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Effects of Changing Items in Intelligence Test on Distribution of Norm Group and Computation of Standardized Score: Focused on Digit Symbol in K-WAIS and Coding in K-WAIS-IV
Korean J Stress Res 2019;27:82-90
Published online March 31, 2019
© 2019 Korean Society of Stress Medicine.

Seung-Min Oh , Sung-Won Choi

Department of Psychology, Duksung Women’s University, Seoul, Korea
Correspondence to: Sung-Won Choi Department of Psychology, Duksung Women’s University, 33 Samyang-ro 144-gil, Dobong-gu, Seoul 01369, Korea Tel: +82-2-901-8307 Fax: +82-2-901-8301 E-mail:
Received January 14, 2019; Revised February 13, 2019; Accepted February 15, 2019.
Articles published in stress are open-access, distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


The present study examined whether any unconsidered variable during revision of the K-WAIS would lower reliability of its standardized score.


In this study, a group of participants were assigned to perform modified ‘coding’ tests, respectively. To avoid the norm group issue, all the conditions except the stimuli were set identical across the tests. Analysis focused on finding variables which would contribute to difference among the tests, including their distribution patterns.


The results showed that physical differences of spatial organization across the tests and background such as figure shapes attributed to significant difference between ‘digit symbol’ in K-WAIS and ‘coding’ in K-WAIS-IV.


It suggests possibility of different difficulty level between ‘digit symbol’ in K-WAIS and ‘coding’ in K-WAIS-IV. Analysis of performance distribution also indicates that the test with better performance (K-WAIS coding) may have lower difficulty because its score distribution was more negatively skewed than that of the other.

Keywords : K-WAIS, K-WAIS-IV, Coding, Standardized score, Skewness

March 2020, 28 (1)

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