Main Classes used for fitting a given data set 
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| namespace   | ROOT::Fit::FitUtil | 
|   | namespace defining utility free functions using in Fit for evaluating the various fit method functions (chi2, likelihood, etc..) given the data and the model function 
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| class   | ROOT::Fit::FitConfig | 
|   | Class describing the configuration of the fit, options and parameter settings using the ROOT::Fit::ParameterSettings class.  More...
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| class   | ROOT::Fit::FitResult | 
|   | class containing the result of the fit and all the related information (fitted parameter values, error, covariance matrix and minimizer result information) Contains a pointer also to the fitted (model) function, modified with the fit parameter values.  More...
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| class   | ROOT::Fit::Fitter | 
|   | Fitter class, entry point for performing all type of fits.  More...
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| class   | ROOT::Fit::ParameterSettings | 
|   | Class, describing value, limits and step size of the parameters Provides functionality also to set/retrieve values, step sizes, limits and fix the parameters.  More...
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