FindDistributionParameters

FindDistributionParameters[data,dist]
finds the parameter estimates for the distribution dist from data.

FindDistributionParameters[data,dist,{{p,p0},{q,q0},}]
finds the parameters p, q, with starting values , , .

Details and OptionsDetails and Options

  • FindDistributionParameters returns a list of replacement rules for the parameters in dist.
  • The data must be a list of possible outcomes from the given distribution dist.
  • The distribution dist can be any parametric univariate, multivariate, or derived distribution with unknown parameters.
  • The following options can be given:
  • AccuracyGoalAutomaticthe accuracy sought
    ParameterEstimator"MaximumLikelihood"what parameter estimator to use
    PrecisionGoalAutomaticthe precision sought
    WorkingPrecisionAutomaticthe precision used in internal computations
  • The following basic settings can be used for ParameterEstimator:
  • "MaximumLikelihood"maximize the loglikelihood function
    "MethodOfMoments"match raw moments
    "MethodOfCentralMoments"match central moments
    "MethodOfCumulants"match cumulants
    "MethodOfFactorialMoments"match factorial moments
  • The maximum likelihood method attempts to maximize the log-likelihood function , where are the distribution parameters and is the PDF of the symbolic distribution.
  • The method of moments solves , , where is the ^(th) sample moment and is the ^(th) moment of the distribution with parameters .
  • Method-of-moment-based estimators may not satisfy all restrictions on parameters.

ExamplesExamplesopen allclose all

Basic Examples  (2)Basic Examples  (2)

Obtain the maximum likelihood parameter estimates assuming a Laplace distribution:

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Obtain the method of moments estimates:

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Estimate parameters for a multivariate distribution:

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Compare the difference between the original and estimated PDFs:

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Introduced in 2010
(8.0)