![]() We interpret these results as indicating it is unlikely any sampling limitations of past research using the PCL-R resulted in findings that were, overall, strongly biased or unrepresentative. The findings were highly consistent with those typically reported in previous studies. ![]() Consistent with professional standards, it is strongly recommended that new users obtain the PCLR 2nd Edition and that existing users change to the 2nd Edition for all new assessments. We examined the distribution of PCL-R scores, classical test theory indices of its structural reliability, the factor structure of test items, and the external correlates of test scores. The Hare Psychopathy ChecklistRevised (PCLR) is available for ongoing projects. Because offenders were admitted for assessment prior to institutional classification, they comprise a sample that was heterogeneous with respect to correctional risks and needs yet representative of all offenders in that region of the service. In the current study, we evaluated the psychometric properties of PCL-R scores for all male offenders admitted to a regional reception center of the Correctional Service of Canada during a 1-year period (n = 375). This potentially complicates the interpretation of test scores and research findings, including the "norms" for offenders from the United States and Canada included in the PCL-R manual. ![]() Despite the abundance of research using the PCL-R, the vast majority of research used samples of convenience rather than systematic methods to minimize sampling bias and maximize the generalizability of findings. The Hare Psychopathy Checklist-Revised (PCL-R Hare, 2003) is a commonly used psychological test for assessing traits of psychopathic personality disorder.
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