A psychometrician develops and evaluates methods for measuring psychological attributes. Psychometric reliability concerns consistency or precision, while construct validity concerns what interpretation of a score the evidence supports. A measure can be highly consistent yet systematically reflect an unintended ability. A psychometrician therefore studies item behavior, scoring rules and comparison populations as well as whether a test produces repeatable numbers. [ref]

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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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