# Fitting in Mathematica: Which function? [closed]

in other programs, there is a possibility to take a data set and to find the function which fits best. Is there also such a possibility in Mathematica?

I only could find LinearModelFit or NonlinearModelFit, where you have to give the function.

For example, I want to find the best function for the following data plot:

How to find it?

• Seen FindFormula[]? – J. M.'s technical difficulties Nov 20 '15 at 15:45
• You do not have to give the function for Mathematica to do the fit. What you are giving are called basis functions the combinations (linear or non-linear) of which form the fitted function. – Lotus Nov 20 '15 at 15:50
• The curve you show looks easy to fit, but one needs to have data. Generally, I would play with several functions like x^a, where a<1 and may be x^a/(1+x^a) and alike. – Alexei Boulbitch Nov 20 '15 at 15:55
• How do you define "best"? – chuy Nov 20 '15 at 16:50
• @QuantumMechanics, please, take a look here as a starting point. And provide your data points. – garej Nov 20 '15 at 21:39