WorksheetFunction.Weibull_Dist(Double, Double, Double, Boolean) Method
Definition
Important
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Returns the Weibull distribution. Use this distribution in reliability analysis, such as calculating the mean time to failure for a device.
public:
double Weibull_Dist(double Arg1, double Arg2, double Arg3, bool Arg4);public double Weibull_Dist (double Arg1, double Arg2, double Arg3, bool Arg4);Public Function Weibull_Dist (Arg1 As Double, Arg2 As Double, Arg3 As Double, Arg4 As Boolean) As DoubleParameters
- Arg1
- Double
X - The value at which to evaluate the function.
- Arg2
- Double
Alpha - A parameter to the distribution.
- Arg3
- Double
Beta - A parameter to the distribution.
- Arg4
- Boolean
Cumulative - Determines the form of the function.
Returns
Remarks
If x, alpha, or beta is non-numeric, Weibull_Dist returns the #VALUE! error value.
If x < 0, Weibull_Dist returns the #NUM! error value.
If alpha ≤ 0 or if beta ≤ 0, Weibull_Dist returns the #NUM! error value.
The equation for the Weibull cumulative distribution function is:
Figure 1: Equation for the Weibull cumulative distribution
The equation for the Weibull probability density function is:
Figure 2: Equation for the Weibull probability density
When alpha = 1, Weibull_Dist returns the exponential distribution with:
Figure 3: Equation