FindFit

FindFit[data, expr, pars, vars]
finds numerical values of the parameters pars that make expr give a best fit to data as a function of vars. The data can have the form , where the number of coordinates x, y, ... is equal to the number of variables in the list vars. The data can also be of the form , with a single coordinate assumed to take values , , ....

FindFit[data, {expr, cons}, pars, vars]
finds a best fit subject to the parameter constraints cons.

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