Introduction

Please select an option from the pull-down menu above.

Text data editor

Cut-and-paste text or edit data here

Convert commas to spaces (1,2,0,3 yields 1 2 0 3) Use comma as decimal separator (1,203 = 1.203) Remove commas from text (1,2,0,3 yields 1203)

Standard Unweighted Fitting: no weights required Weighted Fitting: each data point requires a weight

This data is provided as an example, cut and paste as needed to model your data. All lines of text that do not begin with a number are ignored. Weighted fitting requires an additional number to be used as a weight when fitting. The site does not calculate any weights, which are used as: error = weight * (predicted - actual) You must provide any weights you wish to use. X Y Z 3.017 2.175 0.320 2.822 2.624 0.629 2.632 2.839 0.950 2.287 3.030 1.574 2.207 3.057 1.725 2.048 3.098 2.035 1.963 3.115 2.204 1.784 3.144 2.570 1.712 3.153 2.721 2.972 2.106 0.313 2.719 2.542 0.643 2.495 2.721 0.956 2.070 2.878 1.597 1.969 2.899 1.758 1.768 2.929 2.088 1.677 2.939 2.240 1.479 2.957 2.583 1.387 2.963 2.744 2.843 1.984 0.315 2.485 2.320 0.639 2.163 2.444 0.954 1.687 2.525 1.459 1.408 2.547 1.775 1.279 2.554 1.927 1.016 2.564 2.243 0.742 2.568 2.581 0.607 2.571 2.753

Fitting Target

Here you can select the desired fitting target.

Lowest sum of squared (SSQ) absolute error (traditional) Lowest sum of orthogonal distance (ODR) (robust, slow) Lowest sum of squared (SSQ) relative error (robust, slow) Lowest sum of absolute value of absolute error (robust, slow) Lowest sum of absolute value of relative error (robust, slow) Lowest peak absolute value of absolute error (robust, slow) Lowest peak absolute value of relative error (robust, slow) Lowest AIC (robust, slow) Lowest BIC (robust, slow)

Smoothness Control

Select the maximum number of coefficients for the function finder.
Equations with fewer coefficients are generally smoother.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

Equation Family Inclusion

Select families of equations to include in the function finder.
NOTE: Polyfunctionals are only used in absolute SSQ fitting.

Exponential Logarithmic Miscellaneous Optical Peak Polyfunctional (Unweighted SSQ only) Polynomial Power Rational Roman Surfaces Sigmoidal TaylorSeries

Extended Equation Types Control

Select extended equation types to include in the function finder.

Standard equation types Reciprocal extended types Inverse extended types Linear Growth extended types Linear Decay extended types Exponential Growth extended types Exponential Decay extended types