ACKNOWLEDGMENTS

The minimum bias classification ratemaking proce-dure, introduced by Robert Bailey and LeRoy Simon in 1960, determines rate relativities simultaneously for two or more classification dimensions. This paper summa-rizes the minimum bias procedure for the practicing ac-tuary and provides the intuition for several bias func-tions: balance principle, least squares, Â-squared, and maximum likelihood. The exposition is structured around a series of illustrations using a two-dimensional private passenger automobile classification system: male/female and urban/rural