Sum of MMPI scales F, 4, and 9 as a measure of aggression.

The relationship between scores on the Minnesota Multiphasic Personality Inventory and both concurrent and prior aggression was examined for a sample of 426 19-year-olds from the general population. Aggression was measured through peer nominations obtained concurrently and 10 years earlier. Correlation and regression analysis indicated that the sum of T scores for Scales F, 4, and 9 was a valid measure of aggression. The composite was also shown to have a higher reliability than its component scales. Using an additional 283 subjects from delinquent populations, it was demonstrated that the composite was an excellent discriminator between delinquent and general populations of males and females even when intelligence and social status were controlled.