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ERIC Number: EJ1045403
Record Type: Journal
Publication Date: 2014-Dec
Pages: 18
Abstractor: As Provided
ISSN: ISSN-0007-0998
Incremental Validity of WISC-IV[superscript UK] Factor Index Scores with a Referred Irish Sample: Predicting Performance on the WIAT-II[superscript UK]
Canivez, Gary L.; Watkins, Marley W.; James, Trevor; Good, Rebecca; James, Kate
British Journal of Educational Psychology, v84 n4 p667-684 Dec 2014
Background: Subtest and factor scores have typically provided little incremental predictive validity beyond the omnibus IQ score. Aims: This study examined the incremental validity of Wechsler Intelligence Scale for Children-Fourth UK Edition (WISC-IV[superscript UK]; Wechsler, 2004a, "Wechsler Intelligence Scale for Children-Fourth UK Edition", Harcourt Assessment, London, UK) and factor index scores in predicting academic achievement on the Wechsler Individual Achievement Test-Second UK Edition (WIAT-II[superscript UK]; Wechsler, 2005a, "Wechsler Individual Achievement Test-Second UK Edition", Pearson, London, UK), beyond that predicted by the WISC-IV[superscript UK] FSIQ. Sample: The sample included 1,014 Irish children (ages 6-0 to 16-9) who were referred for evaluation of learning difficulties. Method: Hierarchical multiple regression analyses were used with the WISC-IV[superscript UK] FSIQ (Block 1) and factor index scores (Block 2) as predictors and WIAT-II[superscript UK] subtest and composite scores as dependent variables. Results: The WISC-IV[superscript UK] FSIQ accounted for statistically significant and generally large portions of WIAT-II[superscript UK] subtest and composite score variance. WISC-IV[superscript UK] factor index scores combined to provide statistically significant increments in prediction of most WIAT-II[superscript UK] subtest and composite scores over and above the FSIQ; however, the effect sizes were mostly small as previously observed (i.e., Canivez, 2013a, "Psychol. Assess.", 25, 484; Glutting "et al.", 2006, "J. Spec. Educ.", 40, 103; Nelson "et al.", 2013, "Psychol. Assess.", 25, 618). Individually, the WISC-IV[superscript UK] factor index scores provided small "unique" contributions to predicting WIAT-II[superscript UK] scores. Conclusion: This, in combination with studies of apportioned variance from bifactor confirmatory factor analysis (Watkins et al., 2013, "Int. J. Sch. Educ. Psychol.", 1, 102), indicated that the WISC-IV[superscript UK] FSIQ should retain the greatest weight in WISC-IV[superscript UK] interpretation.
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Ireland
Identifiers - Assessments and Surveys: Wechsler Individual Achievement Test; Wechsler Intelligence Scale for Children