Let be Y = (Y1, ..., Yn) and X = (X1, ..., Xn) series of pair observations and the objective be finding of a function f(x; a1, ..., am) for which Ŷ = f(X) is the best possible solution of the approximation Ŷ ~ Y. Reaching this objective suppose finding of the expression of the f function and of the values of a1, ..., am parameters. Under assumption of agreement between observation and model the...