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Direct linkWatkins, Marley W. – Psychological Assessment, 2006
According to J. B. Carroll's (1993) 3-stratum theory, performance on any subtest reflects a mixture of both 2nd-order and 1st-order factors. To disentangle these influences, variance explained by the general factor should be extracted first. The 1st-order factors are then residualized, leaving them orthogonal to the general factor and each other.…
Descriptors: Intelligence Tests, Children, Thinking Skills, Statistical Analysis
