WeibullBestFitOptions Class

Member of: SynthesisAPI

Represents the analysis settings for the CalculateBestFit method of the associated WeibullDataSet object.

Methods

Name	Description
AllowAllDistributions	Sets the first eleven properties in the class (as shown below) to true.
AllowNoneDistributions	Sets the first eleven properties in the class (as shown below) to false.

Properties

Name	Description
AllowExponential1	Indicates whether the 1-parameter exponential distribution will be considered. Boolean. Default value = True.
AllowExponential2	Indicates whether the 2-parameter exponential distribution will be considered. Boolean. Default value = True.
AllowGamma	Indicates whether the gamma distribution will be considered. Boolean. Default value = True.
AllowGenGamma	Indicates whether the generalized gamma distribution will be considered. Boolean. Default value = True.
AllowGumbel	Indicates whether the Gumbel distribution will be considered. Boolean. Default value = True.
AllowLogistic	Indicates whether the logistic distribution will be considered. Boolean. Default value = True.
AllowLogLogistic	Indicates whether the loglogistic distribution will be considered. Boolean. Default value = True.
AllowLognormal	Indicates whether the lognormal distribution will be considered. Boolean. Default value = True.
AllowNormal	Indicates whether the normal distribution will be considered. Boolean. Default value = True.
AllowWeibull2	Indicates whether the 2-parameter Weibull distribution will be considered. Boolean. Default value = True.
AllowWeibull3	Indicates whether the 3-parameter exponential distribution will be considered. Boolean. Default value = True.
Analysis	Gets or sets a value from the WeibullSolverMethod enumeration, which specifies the method (e.g., RRX, MLE, etc.) for estimating the parameters of the distribution. Default value = 0 (RRX).
ConfBounds	Gets or sets a value from the WeibullSolverCBMethod enumeration, which specifies the method for calculating the confidence bounds. Default value = 0 (Fisher Matrix method).
RankingMethod	Gets or sets a value from the WeibullSolverRankMethod enumeration, which specifies the rank method for calculating the unreliability estimates of the times-to-failure data. Default value = 0 (median ranks).
SortBeforeCalculations	Indicates whether the failures/suspension times in the data set are sorted in ascending order before calculation. Boolean. Default value = True.
UngroupedGroupedData	Indicates whether to ungroup a grouped data set when using rank regression. Boolean. Default value = False.
UseRSRegression	Indicates whether to use ReliaSoft's ranking method (RRM) to calculate the unreliability estimates for times-to-failure data. Boolean. Default value = False.
UseSpecialSort	Indicates whether failures will always be put before suspensions when two identical times are encountered. Boolean. Default value = True.

Example

The following example demonstrates how to initialize the goodness of fit analysis settings for a particular WeibullDataSet object.

VBA

 'Declare a new WeibullDataSet object. 
  Dim WDS As New WeibullDataSet
 
 'Specify the analysis settings. 
  WDS.BestFitSettings.AllowAllDistributions
  WDS.BestFitSettings.Analysis = WeibullSolverMethod_MLE
  WDS.BestFitSettings.ConfBounds = WeibullSolverCBMethod_FisherMatrix
  WDS.BestFitSettings.RankingMethod = WeibullSolverRankMethod_Median
  WDS.BestFitSettings.SortBeforeCalculations = True
  WDS.BestFitSettings.UngroupGroupedData = False
  WDS.BestFitSettings.UseRSRegression = False
  WDS.BestFitSettings.UseSpecialSort = True

 'Add failure times to the data set. 
  Call WDS.AddFailure(10, 1)
  Call WDS.AddFailure(20, 1)
  Call WDS.AddFailure(30, 1)  

 'Analyze the data set. 
  Call WDS.CalculateBestFit()

VB.NET

 'Declare a new WeibullDataSet object. 
  Dim WDS As New WeibullDataSet
 
 'Specify the analysis settings. 
  Call WDS.BestFitSettings.AllowAllDistributions
  WDS.BestFitSettings.Analysis = WeibullSolverMethod.MLE
  WDS.BestFitSettings.ConfBounds = WeibullSolverCBMethod.FisherMatrix
  WDS.BestFitSettings.RankingMethod = WeibullSolverRankMethod.Median
  WDS.BestFitSettings.SortBeforeCalculations = True
  WDS.BestFitSettings.UngroupGroupedData = False
  WDS.BestFitSettings.UseRSRegression = False
  WDS.BestFitSettings.UseSpecialSort = True

 'Add failure times to the data set. 
  WDS.AddFailure(10, 1)
  WDS.AddFailure(20, 1)
  WDS.AddFailure(30, 1)  

 'Analyze the data set. 
  WDS.CalculateBestFit()