Stat Assembly > Stat Assembly Interfaces > IStatistics > IStatistics.Weibull

IStatistics.Weibull

Syntax

Weibull(Value: Double; Alpha: Double; Beta: Double; Cumulative: Boolean): Double;

Parameters

Value. The value for which the distribution is to be calculated. Value must satisfy the following constraint: Value >= 0.

Alpha. Distribution shape parameter. This value must satisfy the following constraint: Alpha > 0. If Alpha = 1, the Weibull function returns the exponential distribution:

Beta. Distribution scale parameter. This value must meet the following constraint: Beta > 0. If Beta = 1, the Weibull function returns the standard distribution.

Cumulative. defines function form:

True. The Weibull function returns integral distribution function.
False. The Weibull function returns the distribution density function.

Description

The Weibull method returns the Weibull distribution.

Comments

This distribution is used for reliability analysis, for example, for calculating the mean time between failures of a device.

Example

To execute the example, add a link to the Stat system assembly.

Sub UserProc;
Var
    st: Statistics;
    d0: Double;
Begin
    st := New Statistics.Create;
    d0 := st.Weibull(59,12,70,True);
    If st.Status <> 0 Then
        Debug.WriteLine(st.Errors);
    Else
        Debug.WriteLine("Weibull distribution: " + d0.ToString);
    End If;
End Sub UserProc;

After you have executed this example the console window shows the Weibull distribution integral function:

Unit execution started

Weibull distribution: 0.120624050633155

Unit execution finished