The measurement of ‘dark’ personality traits has been shown to be susceptible to error. In particular, the Dark Tetrad is theorized to fit poorly to the 4-factor structure within the SD4 (Paulhus et al., 2021). The present study examined the structural validity of the SD4 by using a dataset of internet users (n = 604). A robust approach to confirmatory factor analysis revealed that the 4-factor model proposed by Paulhus et al. (2021) did not appropriately reflect the data. Alternatively, an exploratory 5-factor model (The Dark Five; including coalition-building, grandiose exhibitionism, psychopathy, violent voyeurism, and indirect sadism) resulted in better statistical fit than the 4-factor model. Moreover, the Dark Five allowed the successful discrimination of psychopathy and sadism and explained more variance in attachment orientation than had the 4-factor model. Future research using the SD4 to measure ‘dark’ personalities or to explore differences between psychopathy and sadism may therefore benefit by testing the 5-factor model or opting for a different measure of the Dark Tetrad.
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