Extract the Weibull coefficients

Hello,

I have an excel with wind data (for the purpose of dimensioning a wind farm) over a full year with a reading at each quarter hour. I would like to extract the Weibull coefficients from this data in order to plot the distribution.

Is there a MatLab function to do this? Or another technique?

Thank you very much in advance.

Answer 1

[John D'Errico]

When you don't know what the name of a function in MATLAB might be, use the lookfor function.

lookfor weibull

networkTrafficVideoConference.WeibullScale - Scale parameter for Weibull distribution
networkTrafficVideoConference.WeibullShape - Shape parameter for Weibull distribution
surfaceReflectivityCustom.SpeckleScale - Scale parameter for Weibull and Rayleigh speckle distribution
surfaceReflectivityCustom.SpeckleShape - Shape value for Weibull distribution
surfaceReflectivityLand.SpeckleScale - Scale parameter for Weibull and Rayleigh speckle distribution
surfaceReflectivityLand.SpeckleShape - Shape value for Weibull distribution
surfaceReflectivitySea.SpeckleScale - Scale parameter for Weibull and Rayleigh speckle distribution
surfaceReflectivitySea.SpeckleShape - Shape value for Weibull distribution
classreg.learning.regr.CompactRegressionTree.gather - Gather properties of Statistics and Machine Learning Toolbox object from GPU
prob.NormalDistribution.cdf    - Cumulative distribution function
prob.NormalDistribution.icdf   - Inverse cumulative distribution function
prob.NormalDistribution.iqr    - Interquartile range of probability distribution
prob.NormalDistribution.mean   - Mean of probability distribution
prob.NormalDistribution.median - Median of probability distribution
prob.NormalDistribution.negloglik - Negative loglikelihood of probability distribution
prob.NormalDistribution.paramci - Confidence intervals for probability distribution parameters
prob.NormalDistribution.pdf    - Probability density function
prob.NormalDistribution.plot   - Plot probability distribution object
prob.NormalDistribution.proflik - Profile likelihood function for probability distribution
prob.NormalDistribution.random - Random numbers
prob.NormalDistribution.std    - Standard deviation of probability distribution
prob.NormalDistribution.truncate - Truncate probability distribution object
prob.NormalDistribution.var    - Variance of probability distribution
prob.WeibullDistribution       - Weibull probability distribution object
prob.WeibullDistribution.A     - Scale parameter
prob.WeibullDistribution.B     - Shape parameter
prob.WeibullDistribution.IsTruncated - Logical flag for truncated distribution
prob.WeibullDistribution.NumParameters - Number of parameters
prob.WeibullDistribution.ParameterCovariance - Covariance matrix of the parameter estimates
prob.WeibullDistribution.ParameterIsFixed - Logical flag for fixed parameters
prob.WeibullDistribution.ParameterValues - Distribution parameter values
prob.WeibullDistribution.Truncation - Truncation interval
prob.WeibullDistribution.DistributionName - Probability distribution name
prob.WeibullDistribution.InputData - Data used for distribution fitting
prob.WeibullDistribution.ParameterDescription - Distribution parameter descriptions
prob.WeibullDistribution.ParameterNames - Distribution parameter names
wblcdf                         - Weibull cumulative distribution function
wblfit                         - Weibull parameter estimates
wblinv                         - Weibull inverse cumulative distribution function
wbllike                        - Weibull negative log-likelihood
wblpdf                         - Weibull probability density function
wblplot                        - Weibull probability plot
wblrnd                         - Weibull random numbers
wblstat                        - Weibull mean and variance
networkTrafficVideoConference.WeibullScale - Scale parameter for Weibull distribution
networkTrafficVideoConference.WeibullShape - Shape parameter for Weibull distribution

If you scan down the list of functions found, you will see wblfit. I'd bet that might help. Again, learn about the lookfor utility.

[Armel]

Thanks ! That's what I was looking for !