Factor structure of the Self-Report Psychopathy scale (SRP-II) in non-forensic samples

Two studies were conducted to uncover the factor structure of the Self-Report Psychopathy (SRP-II) scale in non-forensic samples. In Study 1 (N=289 students), the full 60 items yielded two large factors explaining 21% of the variance. The first factor was a combination of anti-social behavior, impulsivity, and interpersonal manipulation. The second factor resembled the Big Five factor of emotional stability. These factors do not correspond well with the traditional Behavior and Personality factors found in forensic work. Study 2 (N=356 students) examined the 31 items conceptually assigned to the Personality and Behavior factors by Hare, Harpur, and Hemphill (1989). Correlations with a comprehensive battery of delinquent behaviors indicated that only the Behavioral factor was predictive. The SRP-II total score (either 60 or 31 items) remains valid but its factor structure in non-forensic samples does not parallel that of the standard forensic instrument, the PCL-R.