description Charles Spearman Overview
Charles Spearman was a British psychologist and statistician who made foundational contributions to intelligence testing and psychometrics. From patterns of positive correlation among different mental tests, he proposed a general intelligence factor, called g, alongside abilities specific to individual tasks. He also developed early factor-analytic methods and introduced Spearman's rank correlation coefficient, a nonparametric measure of association between ranked variables.
insights Ranking position
Charles Spearman ranks #21 of 228 in the Psychologist ranking, behind Michael Posner, ahead of Ulric Neisser.
help Charles Spearman FAQ
What did Charles Spearman mean by the g factor?
Spearman used g to describe the general mental ability shared across different cognitive tasks. He proposed it after observing that people who performed well on one kind of mental test tended to perform well on others.
What is the difference between Spearman's g and s factors?
In Spearman's two-factor theory, g contributes to performance across many tasks, while an s factor represents ability specific to a particular task. A vocabulary test and a spatial test could therefore share g while also requiring different specific abilities.
What statistical methods is Charles Spearman known for?
Spearman helped develop factor analysis as a way to infer underlying abilities from correlations among tests. Spearman's rank correlation coefficient, commonly written as rho, is also named after him.
How does Spearman's intelligence theory differ from Thurstone's?
Spearman emphasized a dominant general factor underlying mental performance. Louis Thurstone instead highlighted several primary mental abilities, such as verbal comprehension, numerical ability, and spatial visualization.
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