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Sources of variance in personality facets: a multiple-rater twin study of self-peer, peer-peer, and self-self (dis)agreement - PubMed

Comparative Study

. 2010 Oct;78(5):1565-94.

doi: 10.1111/j.1467-6494.2010.00661.x. Epub 2010 Jul 20.

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Comparative Study

Sources of variance in personality facets: a multiple-rater twin study of self-peer, peer-peer, and self-self (dis)agreement

Christian Kandler et al. J Pers. 2010 Oct.

Abstract

This study considered the validity of the personality structure based on the Five-Factor Model using both self- and peer reports on twins' NEO-PI-R facets. Separating common from specific genetic variance in self- and peer reports, this study examined genetic substance of different trait levels and rater-specific perspectives relating to personality judgments. Data of 919 twin pairs were analyzed using a multiple-rater twin model to disentangle genetic and environmental effects on domain-level trait, facet-specific trait, and rater-specific variance. About two thirds of both the domain-level trait variance and the facet-specific trait variance was attributable to genetic factors. This suggests that the more personality is measured accurately, the better these measures reflect the genetic structure. Specific variance in self- and peer reports also showed modest to substantial genetic influence. This may indicate not only genetically influenced self-rater biases but also substance components specific for self- and peer raters' perspectives on traits actually measured.

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