title: Confirmatory factor analyses of the WAIS-III standardization data.
abstract: Confirmatory factor analyses with the standardization data of the Wechsler Adult Intelligence Scale-Third Edition (Wechsler, 1997a) compared 6 models with 1 to 4 factors for 11- and 13-subtest versions of the test. Three factors usually fit the data better than 2 factors, but 2-factor models were more parsimonious. A 2-factor model with a Verbal Comprehension factor (Vocabulary, Similarities, Information, and Comprehension) was as good as and sometimes better than the 2-factor model defined by the traditional separation of Verbal and Performance subtests. For 3-factor models, alternative specifications of processing speed subtests on either the Perceptual Organization or Freedom From Distractibility factor were comparable, and specifying a 4th factor for Digit Symbol and Symbol Search had little advantage in comparison with 3-factor models with correlated errors for the 2 subtests.
authors.affiliation: Veterans Affairs Medical Ctr.
authors.forename: L Charles
authors.initials: LC
authors.lastname: Ward
authors.forename: Joseph J
authors.initials: JJ
authors.lastname: Ryan
authors.forename: Bradley N
authors.initials: BN
authors.lastname: Axelrod
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D005163:Factor Analysis, Statistical; D006801:Humans; D007360:Intelligence; D008875:Middle Aged; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014888:Wechsler Scales