Development of a Rasch homogenous short form of the Pathological Narcissism Inventory

Schürch, Eva; Morf, Carolyn C.; Ottiger, Natalie (11 September 2013). Development of a Rasch homogenous short form of the Pathological Narcissism Inventory. In: 13th Congress oft he Swiss Psychological Society, Book of abstracts (p. 192). Schweizerische Gesellschaft für Psychologie (SGP)

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During the last decades, the narcissistic personality inventory (npi) was the most widely used questionnaire to measure narcissism as a personality trait. But the npi assesses grandiose narcissism only, while recent discussions emphasize the existence of vulnerable narcissism. The pathological narcissism inventory (pni, pincus et al., 2009) is a new questionnaire assessing these different aspects of narcissism. However, with 54 items on seven subscales, the pni is quite long to serve as a screening tool for narcissistic traits. We therefore developed a short form to facilitate its application in research and practice. Even though the pni covers different symptoms of narcissism, they are all expressions of the same underlying construct. We therefore used the rasch model to guide the item selection. Method and results: a sample of 1837 participants (67.5% female, mean age 26.8 years) was used to choose the items for the short form. Two criteria were adopted: all aspects, represented by the seven subscales in the original, should be retained, and items should be rasch homogenous. In a step-by-step procedure we excluded items successively until reaching a homogenous pool of 22 items. All remaining items had satisfactory fit indices and fitstatistics for the model were good. characteristics of the resulting short form were tested using a new independent validation sample (n=104, mean age = 32.8, 45% female). Correlations of the short pni with different validation measures were comparable to the correlations obtained with the original form, indicating that the two forms were equivalent. Conclusion: the resulting one-dimensional measure can be used as a screening questionnaire for pathological narcissism. The rasch homogeneity facilitates the comparison of narcissism scores among a variety of samples.

Item Type:

Conference or Workshop Item (Poster)

Division/Institute:

07 Faculty of Human Sciences > Institute of Psychology > Personality Psychology, Differential Psychology and Diagnostics

UniBE Contributor:

Schürch, Eva and Morf, Carolyn

Subjects:

000 Computer science, knowledge & systems
100 Philosophy > 150 Psychology

Publisher:

Schweizerische Gesellschaft für Psychologie (SGP)

Language:

English

Submitter:

Karin Dubler

Date Deposited:

21 May 2014 10:35

Last Modified:

06 Dec 2014 04:38

BORIS DOI:

10.7892/boris.44347

URI:

https://boris.unibe.ch/id/eprint/44347

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