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Online Nonlinear Regression

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This page allows you to work out nonlinear regressions, also known as nonlinear least squares fittings. Because nonlinear optimization methods can be applied to any function, for the relation between two variables, it finds functions that properly fit a given set of data points from a list of more than 100 functions, which include most common and interesting functions, like gaussians, sigmoidals, rationals, sinusoidals... Results are ordered then by the residual sum of squares and shown from the best suiting to the worst suiting case. Unfortunately, they are not always the best possible due to convergence problems for a reasonable calculation time and other problems. Despite of all, this kind of NLR is a great tool and a first step in the goal of automated scientific research.

 Note: If a lot of data points and a high number of parameters are selected, calculations can take some seconds.

Copy & Paste: You can copy and paste data directly from a spreadsheet or a tabulated data file in the box below. Any character that cannot be part of a number -space, comma, tabulation...- is considered a column separator. By default commas are considered column separators; in the case you are using them as decimal separators check the option below. The exponent can be indicated by preceding it by the character E or e, as you can see in the example. Remember data must consist of two columns, x and y, to get the nonlinear regression y=f(x).

 Example:   0.95 5.1e-1 1.91 105.658 2.86 1.777E3
Allow comma as decimal separator

Limit the number of parameters to:

Insert manually & See details: If you prefer you can insert all the points manually, for which you first have to specify the number of data points. You also can see details of the calculation -as the calculated value of y and the error of the best suiting function at each point- in this area.

Enter the number of data points: