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Cover of Hare's Psychopathy Checklist-Revised (2nd ed., 2003). The Psychopathy Checklist or Hare Psychopathy Checklist-Revised, now the Psychopathy Checklist—revised (PCL-R), is a psychological assessment tool that is commonly used to assess the presence and extent of psychopathy in individuals—most often those institutionalized in the criminal justice system—and to differentiate those ...
A study on the relationship between psychopathy scores and types of aggression in a sample of sexual murderers, in which 84.2% of the sample had PCL-R scores above 20 and 47.4% above 30, found that 82.4% of those with scores above 30 had engaged in sadistic violence (defined as enjoyment indicated by self-report or evidence) compared to 52.6% ...
The Psychopathic Personality Inventory (PPI-Revised) is a personality test for traits associated with psychopathy in adults. The PPI was developed by Scott Lilienfeld and Brian Andrews to assess these traits in non-criminal (e.g. university students) populations, though it is still used in clinical (e.g. incarcerated) populations as well.
A study by Chad Brinkley in 2001 tested the concurrent and construct validity of the LSRP with the PCL-R with a sample of prison inmates. [10] Small to moderate correlations were found between the LSRP and PCL-R, as well as associations between primary and secondary psychopathy ("factor 1" and "factor 2" in the PCL-R).
The Five-Factor assessment of personality disorders has also been correlated with the Psychopathy Resemblance Index of the NEO Personality Inventory, as well as with the individual personality dimensions of the NEO-PI-R. [21] It also resolves several issues regarding the PCL-R psychopathy assessment, as a Five-Factor-based re-interpretation of ...
The Hopkins statistic (introduced by Brian Hopkins and John Gordon Skellam) is a way of measuring the cluster tendency of a data set. [1] It belongs to the family of sparse sampling tests. It acts as a statistical hypothesis test where the null hypothesis is that the data is generated by a Poisson point process and are thus uniformly randomly ...
A recent meta-analytic study [13] showed that the lowest SIMS scores are obtained in a group of normal volunteers, somewhat higher SIMS scores are obtained from persons with mild symptoms from car accidents, and the highest SIMS scores are those from patients injured more severely in high impact car accidents and also by malingerers.
The Fowlkes–Mallows index, when results of two clustering algorithms are used to evaluate the results, is defined as [2] = = + + where is the number of true positives, is the number of false positives, and is the number of false negatives.