title: What Does the Shipley-2 Measure for Children and Adolescents? Integrated and Conjoint Confirmatory Factor Analysis With the WISC-IV.
abstract: We used integrated and conjoint confirmatory factor analysis of Shipley-2 and Wechsler Intelligence Scale for Children-Fourth Edition (WISC-IV) data to investigate constructs measured in the Shipley-2 for children and adolescents. We also estimated Shipley-2 composite reliability at the subtest level rather than the item level. The three Shipley-2 subtests for the most part measured what was described in the manual, although Block Patterns measured visual spatial ability in addition to fluid ability and Abstraction was best considered a measure of psychometric g. The g factors derived from the WISC-IV and Shipley-2 were similar but not identical. Internal reliability estimates for Shipley-2 composites that were based on correlations between the subtests were substantially lower than those based on the items. Last, based on WISC-IV derived g factors, 37% to 53% of the variance in Shipley-2 composites was explained by g. Some of the reliable variance in the Shipley-2 composites was due to something specific that the subtests had in common not explained by psychometric g.
authors.affiliation: University of Kansas, Lawrence, KS, USA mreynolds@ku.edu.
authors.forename: Matthew R
authors.initials: MR
authors.lastname: Reynolds
authors.affiliation: University of Kansas, Lawrence, KS, USA.
authors.forename: Daniel B
authors.initials: DB
authors.lastname: Hajovsky
authors.affiliation: University of Kansas, Lawrence, KS, USA.
authors.forename: Jesse R
authors.initials: JR
authors.lastname: Pace
authors.affiliation: University of Kansas, Lawrence, KS, USA.
authors.forename: Christopher R
authors.initials: CR
authors.lastname: Niileksela
mesh_terms: D000293:Adolescent; D002648:Child; D003071:Cognition; D005163:Factor Analysis, Statistical; D006801:Humans; D007360:Intelligence; D007361:Intelligence Tests; D000297:Psychology, Adolescent; D002666:Psychology, Child; D011594:Psychometrics / Q000379:methods*; D014888:Wechsler Scales
keywords: IQ; Shipley-2; WISC-IV; construct validity; internal reliability; psychometric g