Right, the usual stuff.yes indeed (just a money making formula)I suppose Collector's [$]f(x)[$] is given/known a priori? e.g. some polynomial or combination of math functions?
Just one more thing; it is OLS
https://en.wikipedia.org/wiki/Least_squares
and not ODR
https://en.wikipedia.org/wiki/Deming_regression#Orthogonal_regression