org.apache.commons.math.optimization.fitting
Interfaces 
ParametricRealFunction
Classes 
CurveFitter
HarmonicCoefficientsGuesser
HarmonicFitter
HarmonicFitter.ParametricHarmonicFunction
HarmonicFunction
PolynomialFitter
PolynomialFitter.ParametricPolynomial
WeightedObservedPoint