Evaluation of Psychometric Properties of the Short Form of the Five-Factor Narcissism Inventory(FFNI-SF): Iranian Version

Narcissism is a disorder that affects interpersonal relationships and experiences, cognition, inclinations, and emotions, and accurate and early diagnosis of this disorder is important for psychological interventions. Hence, several measurement tools have been developed for this purposeThe aim of the present study was to investigate the psychometric properties of the Sherman Short Form Factor narcissism scale (FFNI-SF). The sample consisted of 576 students of different educational levels of Allameh Tabataba’i, Tehran and Amirkabir Universities who completed FFNI-SF, Pathological Narcissism Inventory (PNI) and narcissistic personality Inventory (NPI). Data analysis was performed using psychometric indices such as internal consistency, test-retest reliability, convergent and construct validity. The results showed that the internal consistency index, Cronbach's alpha, was suitable for the whole questionnaire of 0.87 and for 15 subscales between 0.54 and 0.79. The test-retest reliability of the whole scale in three-week intervals was 0.88 and the test-retest coefficients of the test-retest subscales for 15 subscales were between 0.55 to 0.81, that was suitable. Also, the convergent validity of this questionnaire was significant due to the overall correlation coefficient of the score of this questionnaire with two questionnaires (PNI) and (NPI), respectively, equal to 0.52 and 0.53. The construct validity of this questionnaire, which was performed using confirmatory factor analysis (CFA), also showed a suitable and acceptable fitness of this questionnaire. In general, the results showed that this questionnaire has suitable validity and reliability. Therefore, the Iranian version of this FFNI-SF questionnaire can be used as a suitable tool by experts to assess narcissistic personality traits.