Working with narcissistic personality disorder - Narcissism Test

Results suggest that for each set of reporters, Neuroticism was the best predictor of group membership.

Obsessive-compulsive personality disorder must be differentiated from a personality change due to a medical condition, which affects the central nervous system, and may cause changes in behavior and traits.

Journal of Personality and Social Psychology.

The double-entry intraclass correlation as an index of profile similarity, meaning, limitations, and alternatives.