This project examines the effects of self- and partner-rated personality and their reciprocal interaction between two partners. Personality in 113 young dating couples was measured with the Five-Factor Model and maladaptive personality trait model of the DSM-5. Partners completed self- and partner-reports of the NEO-FFI-3 and the Personality Inventory for DSM-5 (PID-5) as well as the self-report Dyadic Adjustment Scale (DAS). Three sets of Actor-Partner Interdependence Models (APIMs) were run to estimate actor and partner effects of self-rated personality, partner-rated personality, and of both sets of effects simultaneously in an integrated model. When self- and partner-rating models were examined separately, several significant actor and partner effects were observed. However, the strongest effects were observed in the partner-rating models. When self- and partner-rated personality were examined at the same time, most effects from the self-rating models disappeared. Furthermore, most of the effects as well as the strongest one observed were associated with an individual’s perception of their partner’s personality, particularly men’s perception of women’s personality. This study demonstrates the incremental predictive utility of individuals’ perception of their partner’s personality for explaining their own dyadic adjustment.
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