Joshua Naranjo is director of the Statistical Consulting Center and a graduate advisor in the Department of Statistics at Western Michigan University. He received his Ph.D. from Penn State in 1989 under the direction of Professor Tom Hettmansperger. His research has focused on robust regression and diagnostics for method selection. Teaching preferences include linear models and applied statistics.
This paper aims to fill a gap in the literature by providing statistical properties of the population stability index (PSI) and some recommendations on its use.