The Narcissistic Personality Inventory (NPI) is one of the most popular measures of trait narcissism. However, its use of a forced-choice response set may negatively affect some of its psychometric properties. The purpose of the current research was to compare a new Likert version of the NPI, in which only the narcissistic response of each pair was given, to the original NPI, in three samples of
... [Show full abstract] participants (N=1109). To this end, we compared the nomological networks of the forced-choice and Likert formats of the NPI in relation to alternative measures of narcissism, narcissistic personality disorder, entitlement, self-esteem, general personality traits (reported by self and informants), interpersonal styles, and general pathological traits included in the DSM-5. The Likert format NPI – total and subscales – manifested similar construct validity to the original forced-choice format across all criteria with only minor differences that seem to be due mainly to the increased reliability of the Likert NPI Entitlement/Exploitativeness subscale. These results provide evidence that a version of the NPI that employs a Likert format can justifiably be used in place of the original.