ripley at stats.ox.ac.uk wrote: > You are not solving the same problem, which is more than a little `odd'. Why? >>> want to choose the three parameters so that these three integrals are as close to, resp., 2300, 4600 and 5800 as possible. As I have three equations with three unknowns, I expect the exact fit, i.e., the SS (see below) to be zero.