# Package org.apache.commons.math3.fitting

Classes to perform curve fitting.

See: Description

- Class Summary
  Class | Description
  --- | ---
  AbstractCurveFitter | Base class that contains common code for fitting parametric univariate real functions `y = f(pi;x)`, where `x` is the independent variable and the `pi` are the parameters.
  AbstractCurveFitter.TheoreticalValuesFunction | Vector function for computing function theoretical values.
  CurveFitter<T extends ParametricUnivariateFunction> | Deprecated As of 3.3.
  GaussianCurveFitter | Fits points to a `Gaussian` function.
  GaussianCurveFitter.ParameterGuesser | Guesses the parameters `norm`, `mean`, and `sigma` of a `Gaussian.Parametric` based on the specified observed points.
  GaussianFitter | Deprecated As of 3.3.
  GaussianFitter.ParameterGuesser | Guesses the parameters `norm`, `mean`, and `sigma` of a `Gaussian.Parametric` based on the specified observed points.
  HarmonicCurveFitter | Fits points to a `harmonic oscillator` function.
  HarmonicCurveFitter.ParameterGuesser | This class guesses harmonic coefficients from a sample.
  HarmonicFitter | Deprecated As of 3.3.
  HarmonicFitter.ParameterGuesser | This class guesses harmonic coefficients from a sample.
  PolynomialCurveFitter | Fits points to a `polynomial` function.
  PolynomialFitter | Deprecated As of 3.3.
  WeightedObservedPoint | This class is a simple container for weighted observed point in `curve fitting`.
  WeightedObservedPoints | Simple container for weighted observed points used in `curve fitting` algorithms.

## Package org.apache.commons.math3.fitting Description

Classes to perform curve fitting. Curve fitting is a special case of a least-squares problem where the parameters are the coefficients of a function \( f \) whose graph \( y = f(x) \) should pass through sample points, and were the objective function is the squared sum of the residuals \( f(x_i) - y_i \) for observed points \( (x_i, y_i) \).

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