Criterion-Related Validity of the Psychopathic Personality Inventory in a Prison Sample
criterion related validity of Psychopathic Personality Inventory, self report measure of psychopathy based on Psychopathy Checklist–Revised cutting scores, 17–21 yr olds in youthful offender prison.
The Psychopathic Personality Inventory (PPI; S. 0. Lilienfeld & B. P. Andrews, 1996), a self-report measure of psychopathic personality features, and R. D. Hare's (1991) Psychopathy Checklist–Revised (PCL–R) were administered to adult youthful offender prison inmates (N = 50). As hypothesized, PPI scores were significantly correlated with scores on the PCL–R, providing evidence of concurrent validity for the PPI. Moreover, unlike existing self-report psychopathy measures, the PPI showed a moderate and positive correlation with PCL–R Factor 1 (i.e., the core personality traits of psychopathy). Discriminant function analysis using the optimal PPI total score value to predict PCL–R classifications of psychopath (n = 10) and nonpsychopath (n = 40) resulted in accurate classification of 86% of the cases (sensitivity = .50, specificity = .95). Results are discussed in terms of the relative merits of these 2 measures of psychopathy and the validation of the PPI for clinical use.
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Citation / Publisher Attribution
Psychological Assessment, v. 10, issue 4, p. 426-430
Scholar Commons Citation
Poythress, Norman; Edens, John F.; and Lilienfeld, Scott O., "Criterion-Related Validity of the Psychopathic Personality Inventory in a Prison Sample" (1998). Mental Health Law & Policy Faculty Publications. 97.