Abstract
Over 500 working adults completed two intelligence tests: the GMA (Graduate Management Assessment) and the WG (Watson-Glaser), a measure of the Big-Five personality traits (NEO-FFM), and a personality disorders measure (Hogan Development Survey). Regressing first the Big-Five personality traits, then the personality disorders, onto the two different measures of intelligence suggested evidence for the incremental validity of personality disorders, which in both studies accounted for an additional 5% of the variance. Results were slightly different in the two analyses though clearly obsessive-compulsiveness is negatively correlated with intelligence test scores.
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