ERIC Number: EJ1051356
Record Type: Journal
Publication Date: 2015-Mar
Abstractor: As Provided
Reference Count: 38
Incremental Criterion Validity of the WJ-III COG Clinical Clusters: Marginal Predictive Effects beyond the General Factor
McGill, Ryan J.
Canadian Journal of School Psychology, v30 n1 p51-63 Mar 2015
The current study examined the incremental validity of the clinical clusters from the Woodcock-Johnson III Tests of Cognitive Abilities (WJ-III COG) for predicting scores on the Woodcock-Johnson III Tests of Achievement (WJ-III ACH). All participants were children and adolescents (N = 4,722) drawn from the nationally representative WJ-III standardization sample. Hierarchical multiple regression analyses were used to assess for cluster-level effects after controlling for the variance accounted for by the General Intellectual Ability (GIA) composite score. Consistent with previous studies, the GIA accounted for clinically significant portions of WJ-III ACH score variance in all of the regression models with R[superscript 2] values ranging from 0.33 to 0.63. The clinical cluster scores collectively accounted for small to moderate incremental effects with no meaningful effects observed for individual indicators. Potential implications of these results for empirically supported interpretation of the WJ-III COG are discussed.
Descriptors: Validity, Cognitive Tests, Achievement Tests, Predictive Validity, Scores, Children, Adolescents, Multiple Regression Analysis, Cluster Grouping
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Authoring Institution: N/A
Identifiers - Assessments and Surveys: Woodcock Johnson Tests of Achievement; Woodcock Johnson Tests of Cognitive Ability