Psychometric properties of the mini-IPIP in a large, nationally representative sample of young adults.

Drawing on a large, nationally representative sample of young adults (the National Longitudinal Study of Adolescent Health; N = 15,701; M age = 29.10), we evaluated the psychometric properties of the Mini-IPIP, a 20-item inventory designed to concisely assess the 5 factors of personality. The results suggest that the Mini-IPIP has a 5-factor structure; most of the scales have acceptable reliability; all the scales have partial or full metric invariance; and the scales exhibit some degree of criterion validity. However, the absence of scalar invariance for many of the scales suggests caution when comparing personality scores among groups defined by sex or race and ethnicity. We offer practical considerations for researchers interested in using this inventory with this sample, and also suggestions for modification of the Mini-IPIP.