title: Confirmatory factor analysis of the WAIS-IV/WMS-IV.
abstract: The Wechsler Adult Intelligence Scale-fourth edition (WAIS-IV) and the Wechsler Memory Scale-fourth edition (WMS-IV) were co-developed to be used individually or as a combined battery of tests. The independent factor structure of each of the tests has been identified; however, the combined factor structure has yet to be determined. Confirmatory factor analysis was applied to the WAIS-IV/WMS-IV Adult battery (i.e., age 16-69 years) co-norming sample (n = 900) to test 13 measurement models. The results indicated that two models fit the data equally well. One model is a seven-factor solution without a hierarchical general ability factor: Verbal Comprehension, Perceptual Reasoning, Processing Speed, Auditory Working Memory, Visual Working Memory, Auditory Memory, and Visual Memory. The second model is a five-factor model composed of Verbal Comprehension, Perceptual Reasoning, Processing Speed, Working Memory, and Memory with a hierarchical general ability factor. Interpretative implications for each model are discussed.
authors.affiliation: Pearson, San Antonio, TX, USA. james.holdnack@pearson.com.
authors.forename: James A
authors.initials: JA
authors.lastname: Holdnack
authors.lastname: Xiaobin Zhou
authors.forename: Glenn J
authors.initials: GJ
authors.lastname: Larrabee
authors.forename: Scott R
authors.initials: SR
authors.lastname: Millis
authors.forename: Timothy A
authors.initials: TA
authors.lastname: Salthouse
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001308:Auditory Perceptual Disorders; D003071:Cognition; D003072:Cognition Disorders / Q000175:diagnosis*; D032882:Comprehension; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D007360:Intelligence; D008297:Male; D008568:Memory; D008569:Memory Disorders / Q000175:diagnosis*; D008570:Memory, Short-Term; D008875:Middle Aged; D008960:Models, Psychological; D009483:Neuropsychological Tests; D011594:Psychometrics; D014888:Wechsler Scales; D055815:Young Adult