Item factor structure of the Personality Adjective Check List

This study reports on a principal-components analysis of the Personality Adjective Check List (PACL) at the item level. Data came from a national sample of normal adults and included the responses of 1,058 men and 1,194 women (N = 2,252). Analyses were conducted separately for men and women, and for the sexes combined. The scree test was applied to decide on the number of factors to extract. Retained factors were rotated by varimax and direct oblimin procedures. Results were very similar for each analysis, with coefficients of congruence for the five orthogonal factors obtained from men and women separately being .95, .92, .94, .94, and .92. The five unipolar personality dimensions isolated were interpreted as Aggressive/Dominant, Neurotic, Conscientious, Detached/Introverted, and Surgent/Extraverted. These were compared to item factors of the Million Clinical Multiaxial Inventory (MCMI-I), MCMI-II, Adjective Check List (ACL), and to Norman's Big Five dimensions.