Summary
L'Échelle d'Intelligence de Wechsler pour adultes - troisième édition (WAIS-III; Wechsler, 1997a; Wechsler, 2001) fournit des indicateurs basés sur des facteurs et donne une analyse de niveau intermédiaire entre le QI et les sous-tests individuels. Le présent article présente des tableaux permettant de comparer tous les indices à l'indicateur moyen et d'identifier la signification statistique et la fréquence relative des différences obtenues. La méthode simultanée ou ipsative que nous présentons peut permettre d'éviter certains pièges inhérents aux comparaisons multiples par paire, telles que la diminution de la possibilité d'interprétation et le risque exagéré d'erreurs de type 1.
With the introduction of the Wechsler Intelligence Scale for Children - Third Edition (WISC-III: Wechsler, 1991), and, subsequently, the Wechsler Adult Intelligence Scale - Third Edition (WAIS-III: Wechsler, 1997a, 2001), factor-based index scores have been provided, reflecting relatively more homogenous selections of skills and abilities than those making up the standard Verbal and Performance IQs. For the WAIS-III, Verbal IQ has been separated and expanded into the Verbal Comprehension (VCl) and Working Memory (WMl) indices, while the Performance IQ has been broadened into the Perceptual Organization (POl) and Processing Speed (PSl) indices. These indices combine the greater reliability of the IQ scores with the greater cognitive specificity associated with the subtest scores, producing scores that may avoid some of the pitfalls of interpreting subtest score profiles, namely, the poor reliability of these profiles (Livingston, Jennings, Reynolds, & Gray, 2003; McDermott, Fantuzzo, Glutting, Watkins, & Baggaley, 1992).These concerns are only important if the index score profile can provide clinical or diagnostic information. Fortunately for users of the Wechsler scales, there is evidence that profiles of specific index strengths or weaknesses are associated with particular clinical and normative groups. For example, a reduced PSI is a common consequence of traumatic brain injury (Donders, Tulsky, & Zhu, 2001; Langeluddecke & Lucas, 2003) or a dementing process (Wechsler, 1997b, pp. 145-153). For adults with a history of learning disabilities, a reduced WMI is common (Wechsler, 1997b, pp. 176-178). In the WAIS-III normative sample, five clusters were derived based on index score profiles (Donders, Zhu & Tulsky, 2001). Three clusters differed by overall score elevation, but the remaining two profiles were characterized by a relative strength or a weakness on the PSI, compared to the remaining indices. Thus, index score profiles may help to characterize performance of both clinical and normal groups, and, by inference, individuals.See the full content of this document
Extract
Ipsative Comparisons of Index Scores for the Canadian Wais-Iii
With the introduction of the Wechsler Intelligence Scale for Children - Third Edition (WISC-III: Wechsler, 1991), and, subsequently, the Wechsler Adult Intelligence Scale - Third Edition (WAIS-III: Wechsler, 1997a, 2001), factor-based index scores have been provided, reflecting relatively more homogenous selections of skills and abilities than those making up the standard Verbal and Performance IQs. For the WAIS-III, Verbal IQ has been separated and expanded into the Verbal Comprehension (VCl) and Working Memory (WMl) indices, while the Performance IQ has been broadened into ...
See the full content of this document
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