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Scoring Reliability on the Wechsler Adult Intelligence Scale-Third Edition (WAIS-III)

Joseph J. Ryan

Central Missouri State University

Summer D. Schnakenberg-Ott

Central Missouri State University

Nineteen psychologists and 19 graduate students scored two Wechsler Adult Intelligence Scale-Third Edition patient protocols. Mean IQs and indexes were similar across groups, but the ranges for Verbal IQ (VIQ), Performance IQ (PIQ), and Full Scale IQ (FSIQ) on one protocol were 25, 22, and 11 points, respectively. For both protocols taken together, percentages of agreement with the "actual" IQs for psychologists were only 26.3 for VIQ, 36.8 for PIQ, and 42.1 for FSIQ. For students, percentages were 15.8 for VIQ, 23.7 for PIQ, and 31.6 for FSIQ. The percentages of FSIQs that fell within ± 1 standard error of measurement of the actual IQs were 89.5 for psychologists and 76.3 for students. Scoring error also had a negative impact on index scores. Both groups were confident about their scoring accuracy.

Key Words: WAIS-III • scoring reliability • indexes • scoring error • confidence rating

Assessment, Vol. 10, No. 2, 151-159 (2003)
DOI: 10.1177/1073191103010002006
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C. J. Hopwood and D. C. S. Richard
Graduate Student WAIS-III Scoring Accuracy Is a Function of Full Scale IQ and Complexity of Examiner Tasks
Assessment, December 1, 2005; 12(4): 445 - 454.
[Abstract] [PDF]