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ERIC Number: EJ797681
Record Type: Journal
Publication Date: 2005-Sep
Pages: 10
Abstractor: As Provided
Reference Count: 40
ISSN: ISSN-1937-6928
Diagnostic Validity of Wechsler Substest Scatter
Watkins, Marley W.
Learning Disabilities: A Contemporary Journal, v3 n2 p18-27 Sep 2005
Cognitive subtest scatter has often been considered to be diagnostically significant. The current study tested the diagnostic validity of four separate operationalizations of WISC-III subtest scatter: (a) range of verbal, performance, and full-scale subtests; (b) variance of verbal, performance, and full-scale subtests; (c) number of subtests deviating by [plus or minus] 3 points from verbal, performance, and full-scale average; and (d) Mahalanobis distance of full-scale subtests. The WISC-III normative sample was compared to 1,592 students with learning disabilities (LD). Scatter indices were strongly correlated with each other (i.e., r = 0.81 to 0.95). Receiver operating characteristic (ROC) curve analyses revealed that using any of the subtest scatter indices to diagnose LD resulted in correct decisions only 50% to 55% of the time. Chance would afford similar levels of accuracy. (Contains 2 tables and 1 figure.)
Learning Disabilities Worldwide, Inc. P.O. Box 142, Weston, MA 02493. Tel: 781-890-5399; Fax: 781-890-0555; Web site:
Publication Type: Journal Articles; Reports - Evaluative
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Assessments and Surveys: Wechsler Intelligence Scale for Children