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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.Elevation of the T scores on both Scales 4 and 9 of the Minnesota Multiphasic Personality Inventory (MMPI) has been thought to form the profile characteristic of the male juvenile delinquent (Dahlstrom Dahlstrom, Welsh, Hathaway Hathaway Megargee & Mendelsohn, 1962).Dahlstrom et al. (1972) noted that marked elevations on Scale 4 can be observed in prison groups.These authors also noted that Scale 9 (Hypomania) appears to energize the pattern related to Scale 4. Scale 9 was viewed by Hathaway and Monachesi (1953) as an exciter that in combination with
Huesmann et al. (Sun,) studied this question.