Citation

St. Laurent, R.T. & Cook, R.D. (1992).   Leverage and superleverage in nonlinear regression.   Journal of the American Statistical Association 87: 985-990.

Abstract

Several measures of leverage of an observation in a nonlinear regression model are defined and developed. In contrast to the upper bound on the leverage in a linear model, it is found that in a nonlinear model the leverage of an observation may exceed 1. Such a case is said to exhibit superleverage. Relationships between the leverage measures are explored, and several examples are developed to illustrate the proposed methodology.

Keywords

Diagnostic; influential observation; prediction.