What Does the Shipley-2 Measure for Children and Adolescents? Integrated and Conjoint Confirmatory Factor Analysis With the WISC-IV. (February 2016)

• Record Type: Journal Article
• Authors: Reynolds, Matthew R.; Hajovsky, Daniel B.; Pace, Jesse R.; Niileksela, Christopher R.
• Is Part Of: Assessment. Volume 23:Number 1(2016:Feb.)
• Page Start: 23
• Page End: 41
• Publication Date: 2016-02
• Subjects: Shipley-2 -- psychometric g -- IQ -- construct validity -- WISC-IV -- internal reliability; Psychological tests -- Periodicals; Psychodiagnostics -- Periodicals; Personality tests -- Periodicals; 150.287
• DOI: 10.1177/1073191115572695
• Languages: English
• ISSNs: 1073-1911

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 .