Is the Measure Good Enough? Measurement Invariance and Validity of the Clance Imposter Phenomenon Scale in a University Population.

Imposter Phenomenon (IP) was coined in 1978 by Clance and Imes and has been an important construct in explaining individuals' experiences of believing that achievements are a result of luck or misperceptions of others rather than personal competence. The Clance Imposter Phenomenon Scale (CIPS), developed in 1985, is a prominent operationalization of this construct. Although this scale has been widely used since its inception, its factor structure has been inconsistent across studies and no tests of measurement invariance are documented in the literature. Using a large university sample (n = 830), the current study was designed to: (a) examine the factor structure of the CIPS using cross validation, (b) examine measurement invariance across gender, and (c) examine differences in the CIPS factor by demographics. We found that a single factor structure for the CIPS was the best fitting model. We also found that the measure achieved invariance across gender after removing item 18 (and in the absence of items 1, 2, and 19, removed for poor fit). Finally, we found that being single, a woman, and having experienced lower socioeconomic status (SES) were all associated with higher IP. We discuss these findings in the context of a university setting and suggest avenues for future research.