Tuesday, July 07, 2009

WJ III CHC cluster g an specificity characteristics: Floyd et al. (2009) published

The following article, which was previously previewed in an earlier post, has now been published. Check the prior post for links to supplementary tables mentioned in the article. [Conflict of interest disclosure - I am a co-author of the WJ III, which was the focus of this publication]
  • Floyd, R., McGrew, K., Barry, A., Rafael, F & Rogers, J. (2009) General and Specific Effects on Cattell–Horn–Carroll Broad Ability Composites: Analysis of the Woodcock–Johnson III Normative Update CHC Factor Clusters Across Development. School Psychology Review, 38(2), 249-265
Many school psychologists focus their interpretation on composite scores from intelligence test batteries designed to measure the broad abilities from the Cattell-Hom-Carroll theory. The purpose of this study was to investigate the general factor loadings and specificity of the broad ability composite scores from one such intelligence test battery, the Woodcock-Johnson Hm Tests of Cognitive Abilities Normative Update (Woodcock, McGrew, Schrank, & Mather, 2007). Results from samples beginning at age 4 and continuing through age 60 indicate that Comprehension-Knowledge, Long-Term Retrieval, and Fluid Reasoning appear to be primarily measures of the general factor at many ages. In contrast, Visual-Spatial Thinking, Auditory Processing, and Processing Speed appear to be primarily measures of specific abilities at most ages. We offer suggestions for considering both the general factor and specific abilities when interpreting Cattell- Horn-Carroll broad ability composite scores.
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