Curve Fitter

Nonlinear Least Squares Regression (Curve Fitter) This page lets you fit any function of up to eight parameters to a set of data. Just specify the function, the data points, and initial guesses to the parameters. When you click the Iterate button, the JavaScript program refines these estimates to produce what should be a better set of parameters. This process is iterative, and with good guesses (and good luck) usually converges to the least squares solution in five to ten iterations. This program can also fit nonlinear Least-Absolute-Value curves and Percentile Curves (having a specified fraction of the points below the curve). (Source: