Wednesday, November 11, 2009

MDS analysis of the WJ III: Implications for CHC theory refinement and extension

IAP AP101 # 3 report is now available (click here for all AP101 reports and briefs).  "IAP AP101 Report #3: MDS Analysis of the CHC-based WJ III Battery: Implications for possible refinements and extensions of the CHC model of human intelligence" can be viewed  or downloaded by clicking here.

The PPT files are also viewable and downloadable via SlideShare.

The WJ III Battery is comprised of both cognitive (intelligence) and achievement components.  As reported in the technical manual, the Cattell-Horn-Carroll (CHC) theory of cognitive abilities organizational structure of the WJ III has been validated.  The current investigation analyzed the cognitive and achievement tests for all WJ III norm subjects from ages 6-18 years of age.  Multidimensional scaling (MDS—Guttman Radex model) of the 50 WJ III tests suggested new facets from which to interpret the WJ III.  The results suggested three to four higher-order intermediate CHC model stratum abilities that varied along the dimensions of (a) controlled vs automatic cognitive processing and (b) product- vs process-dominant abilities. The results, together with recent similar analysis of the WAIS-IV, support Woodcock’s Cognitive Performance Model (CPM).  Implications for possible minor changes in the CPM model are suggested.  More importantly, the WJ III and WAIS-IV results collectively suggest hypothesized refinements and extensions of the CHC intelligence framework.   Research focused on exploring the compatibility of a combined CHC and Berlin Model of Intelligence Structure (BIS) theory is recommended.
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