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The Structure of Intellect
J P Guilford
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ability achievement addition adopted analysis appear associated assumed average biological birth blacks and whites Cattell changes characteristics child comparable correlation dealing defined derived determined distribution DZ twins educational effects environment environmental estimate evidence example exist expected experiences factor Figure genetic genotype given grades Guilford heritability higher implies included increase indicate individuals influence intellectual intellectual ability intelligence test scores involving Jensen less loadings lower mean measures mental mothers noted obtained occupational pairs parents particular performance person position possible predictive predictive validity present probability procedure racial range reasons regression relationship relatively reported represent respect sample selection separated siblings similar social Spearman standard status structure subjects substantially success suggest Table tend theory tion variables variance verbal