Nonlin allows you to perform statistical regression analyses
to estimate the values of parameters for linear, multivariate,
polynomial, and general nonlinear functions. The regression analysis
determines the values of the parameters which cause the function
to best fit the observed data that you provide. Nonlin allows
you to specify the form of the function whose parameters are being
estimated using ordinary algebraic notation. In addition to determining
the parameter estimates, Nonlin can be directed to generate an
output file with predicted values and residuals. It can also plot
the observed values and the estimated function and the residual
values. In addition to performing regression analysis, Nonlin
can also be used to find the root (zero value point) or minimum
absolute value of a nonlinear expression.
The nonlinear regression algorithm used by Nonlin was published
in ACM Transactions on Mathematical Software 7,3 (Sept. 1981)
"Dennis, J.E., Gay, D.M., and Welsch, R.E.  An adaptive nonlinear
leastsquares algorithm."
Nonlin is a "shareware" product.
(modified from the documentation)
