Criterion-Related Validity of the Psychopathic Personality Inventory in a Prison Sample

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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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Psychological Assessment, v. 10, issue 4, p. 426-430