A further refinement of earlier NPI versions developed by Raskin and Hall containing 80 and 54 items, respectively, the shortened Narcissistic Personality Inventory-40 (NPI-40) was subjected to three different studies by it’s authors in 1988 to analyze it’s construct validity, and has been used and examined in many studies to date. Daniel Ames developed the NPI-16, a further shortened version based on the NPI-40.
Robert Raskin & Howard Terry
Reliability and Validity
In Raskin & Terry (1988), alpha composite reliability scores of .83, .74, .80, and . 90 were calculated for the Narcissistic Personality Inventory. For a pdf copy of the entire study, see the link in the References section at the bottom of this page.
Obtaining the NPI-40
Administration, Analysis and Reporting
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Raskin, R., & Terry, H. (1988). A principal-components analysis of the Narcissistic Personality Inventory and further evidence of its construct validity. Journal of Personality and Social Psychology, 54, 890–902. http://www.columbia.edu/~da358/npi16/raskin.pdf
Raskin, Robert N., and Calvin S. Hall. (1979). "A Narcissistic Personality Inventory." Psychological Reports 45.2 (1979): 590-590.