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)

Preview

Text abstract_sgp_Basel_2013.pdf - Published Version Available under License Publisher holds Copyright. Download (154kB) | Preview

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.

Interest & Impact

Downloads

310 since deposited on 21 May 2014
10 in the past 12 months

Citations

5 Citations in Web of Science ®
6 Citations in Scopus

Search

in Google Scholar™

Services

Actions (login required)

Edit item

Actions (login required)

Edit item