THE COMPARABILITY OF THE WAIS, WISC, AND WBII

Abstract

Three Wechsler scales (the Wechsler Adult Intelligence Scale, Wechsler Intelligence Scale for Children, and Wechsler‐Bellevue II) were administered in a counterbalanced design to 72 randomly selected 17 year‐old high school Ss in order to investigate their comparability by testing the equality of ( a ) means, ( b ) variances, ( c ) reliability coefficients, and ( d ) validity coefficients based on scaled scores and IQs. Results indicated that the subtest scores and IQs for the given three scales were not equivalent. The present findings conform with most of the previous results regarding the comparability of Wechsler scales. Although the three scales investigated all evidence high similarity of item content and format, they clearly fail to meet the statistical criteria of equivalence for 17 year‐old subjects.