The revised Psychopathy Checklist: Reliability and factor structure.

@article{Hare1990TheRP,
  title={The revised Psychopathy Checklist: Reliability and factor structure.},
  author={Robert D. Hare and Timothy John Harpur and A. Ralph Hakstian and Adelle Forth and Stephen D. Hart and Joseph P. Newman},
  journal={Psychological Assessment},
  year={1990},
  volume={2},
  pages={338-341}
}
The revised Psychopathy Checklist (PCL) is a 20-item scale scored from interview and file information. Analyses of data from 5 prison samples (N= 92 5) and 3 forensic psychiatric samples (N= 356) indicate that the revised PCL resembles its 22-item predecessor in all important respects. It has excellent psychometric properties, and it measures 2 correlated factors that were cross-validated both within and between samples. Correlations between the original PCL and the revised version approached… 

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