Trait aggression has been studied for decades and yet remains adrift from broader frameworks of personality such as the Five Factor Model. Across two datasets from undergraduate participants (Study 1: N = 359; Study 2; N = 620), we observed strong manifest and latent correlations between trait aggression and lower agreeableness (i.e., greater antagonism). Trait aggression was also linked to greater neuroticism and lower conscientiousness, but their effect sizes fell beneath our preregistered threshold. Subsequent item-level analyses were unable to articulate trait aggression and agreeableness items into separate factors using the IPIP-NEO, but not the Big Five Inventory. Our findings suggest that trait aggression is accurately characterized as primarily a facet of antagonism, while also reflecting other personality dimensions.
Keywords: Five Factor Model; agreeableness; antagonism; personality; trait aggression.