Nonlin Software -

refers to programs that use iterative algorithms (like Gauss-Newton, Levenberg-Marquardt, or Simplex) to fit data to models where parameters are not simply additive. Unlike linear regression, which solves equations in one step, nonlinear software must guess, check, adjust, and re-guess until it finds the best fit.

(AUC) experiments, helping researchers define molecular mass, stoichiometry, and association constants in solution. While newer packages like nonlin software