A ' single general factor' in dissimilar mental tests.3. The cosine expression for cmrelation; and the consequent condition that three correlated variables should be completely expressible i n terns of only two independent factors.4. 'Cleverness,' a group factor in tests of certain intel2ectual qualities; and its relation to 'General Ability.' 5. Group factors in tests of similar qualities.6. 'Purpose,' a group factor in tests of certain character qualities.7 .Summary of Conclusions.
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John C. Garnett (1919) studied this question.
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