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Testing Spearman’s Hypothesis with Alternative Intelligence Tests: A Meta-Analysis

Jan te Nijenhuis, Michael van den Hoek and Denise Willigers


Spearman’s hypothesis states that differences between groups on subtests of an IQ battery are a function of the g loadings of these subtests. We examined Spearman’s hypothesis in alternative tests of intelligence. We compared various groups. We carried out a meta-analysis based on 20 data points and a total of 8,322 Whites and 2,507 minority group members. Spearman’s hypothesis was strongly confirmed with a mean r of .62. We conclude that group differences are to the same degree a function of g when they are measured with traditional test batteries as when they are measured using alternative test batteries.

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