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A principal-components analysis of the Narcissistic Personality Inventory and further evidence of its construct validity.
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Abstract
We examined the internal and external validity of the Narcissistic Personality Inventory
(NPI). Study 1 explored the internal structure of the NPI responses of 1,018 subjects.
Using principal-components analysis, we analyzed the tetrachoric correlations among
the NPI item responses and found evidence for a general construct of narcissism as
well as seven first-order components, identified as Authority, Exhibitionism, Superiority,
Vanity, Exploitativeness, Entitlement, and Self-Sufficiency. Study 2 explored the
NPI's construct validity with respect to a variety of indexes derived from observational
and self-report data in a sample of 57 subjects. Study 3 investigated the NPI's construct
validity with respect to 128 subject's self and ideal self-descriptions, and their
congruency, on the Leary Interpersonal Check List. The results from Studies 2 and
3 tend to support the construct validity of the full-scale NPI and its component scales.