Discrepancy Score Reliabilities in the WAIS-IV Standardization Sample

Abstract

In the present investigation, the authors provide internal consistency reliabilities for Wechsler Adult Intelligence Scale—Fourth Edition (WAIS-IV) subtest and Index discrepancy scores using the standardization sample as the data source. Reliabilities ranged from .55 to .88 for subtest discrepancy scores and .80 to .91for Index discrepancy scores. Thus, the reliabilities of the WAIS-IV subtest discrepancy scores did not reach the ≥ .90 criterion recommended for clinical decision-making, whereas four Index score coefficients reached this reliability standard. If the purpose is to generate hypotheses based on discrepancy scores, 23 of the 66 subtests and all of the Index reliabilities are ≥ .80.