The following goodness-of-fit measure (Buse 1973) is reported: This is a measure of the proportion of the transformed sum of squares ... both the R-squared formulas given here reduce to the usual ...

The Sum Squares function, also referred to as the Axis Parallel Hyper-Ellipsoid function, has no local minimum except the global one. It is continuous, convex and unimodal. It is shown here in its two ...