The Initial Development, Factor Structure, and Psychometric Validation of the Impostor Phenomenon Assessment (IPA): A Novel Assessment of Impostor Phenomenon
Abstract
Despite growing attention surrounding impostor phenomenon (also known as “imposter syndrome”), recent reviews have suggested that current measures may be inadequate in capturing the complex and multifaceted nature of this construct (i.e., thoughts, feelings, and behaviours). The objective of my dissertation research program was to clarify the theoretical conceptualization of impostor phenomenon based on experiences in an achievement-oriented setting, and to develop a novel and psychometrically valid method of measuring this construct. I began by conducting an extensive review of the literature and developing an item pool for a novel impostor phenomenon assessment. I then conducted exploratory factor analyses (Study 1) and confirmatory factor analyses (Study 2) to assess the initial item pool and to determine the factor structure and initial psychometric properties (e.g., convergent and divergent validity) of the novel Impostor Phenomenon Assessment (IPA; Study 2 and 3). As an extension to Study 3, I also examined the longitudinal stability of impostor phenomenon and correlates with trait variables and psychological distress across the academic year (baseline and six follow-up timepoints). Results suggested excellent psychometric properties for the novel IPA. Longitudinal findings demonstrated that impostor phenomenon was relatively stable in individuals over time, with intercepts significantly varying as a function of gender and academic year. Model findings for impostor phenomenon showed that self-esteem, self-critical perfectionism, agreeableness, conscientiousness, neuroticism, and rigid perfectionism were significant predictors. Additionally, cross-lagged panel analyses suggested partial support for a causal effect of impostor phenomenon on psychological distress across time. These findings offer preliminary evidence for the reliability and validity of the IPA as a novel measure of impostor phenomenon and are the first to examine the stability of impostor phenomenon in individuals over time.