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Charles Spearman investigated correlations among cognitive performances and developed an account of a shared general intelligence factor with task-specific contributions. This helped make intelligence a subject of explicit measurement and statistical modeling. A fitted common factor describes covariation under a model; it is not automatically a uniquely identified biological mechanism. His name is also attached to Spearman's rank correlation coefficient. [ref]

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A psychometrician who proposed the random-data approach underlying parallel analysis.[ref]

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