| Summary: | This study aimed to gather evidences of validity and reliability of the Dark Triad Dirty Dozen (DTDD) . Two studies were performed. In Study 1, participants were 207 people from the general population , who answered the DTDD and the Big Five Inventory. A Principal Component analysis revealed a three -factor structure: Machiavellianism ( a = 0.85) , narcissism ( a = 0.84 ) and psychopathy ( a = 0.72 ), which were negatively correlated with agreeableness . In study 2, participants were 300 people from the general population , who answered the DTDD . A confi rmatory factor analysis supported the bifactor model (e.g., CFI = 0.95; TLI = 0.92; and RMSEA = 0.07). In conclusion, this measure shows acceptable psychometric parameters, justifying its use to research purposes.
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