Forms, Importance, and Ineffability of Factor Interactions to Define Personality Disorders
Journal of Personality Disorders
First page number:
Last page number:
The emergent interpersonal syndrome (EIS) approach conceptualizes personality disorders as the interaction among their constituent traits to predict important criterion variables. We detail the difficulties we have experienced finding such interactive predictors in our empirical work on psychopathy, even when using uncorrelated traits that maximize power. Rather than explaining a large absolute proportion of variance in interpersonal outcomes, EIS interactions might explain small amounts of variance relative to the main effects of each trait. Indeed, these interactions may necessitate samples of almost 1,000 observations for 80% power and a false positive rate of .05. EIS models must describe which specific traits' interactions constitute a particular EIS, as effect sizes appear to diminish as higher-order trait interactions are analyzed. Considering whether EIS interactions are ordinal with non-crossing slopes or disordinal with crossing slopes, or entail nonlinear threshold or saturation effects may help researchers design studies, sampling strategies, and analyses to model their expected effects efficiently.
Statistical interaction; Effect size; Nonlinear interaction; Personality trait; Compound trait
Medicine and Health Sciences | Mental Disorders | Psychiatry and Psychology
Benning, S. D.,
Smith, E. A.
Forms, Importance, and Ineffability of Factor Interactions to Define Personality Disorders.
Journal of Personality Disorders, 33(5),