WorksheetFunction.Gamma_Inv(Double, Double, Double) Method
Definition
Important
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Returns the inverse of the gamma cumulative distribution. If p = GAMMA_DIST(x,...), then GAMMA_INV(p,...) = x.
public:
double Gamma_Inv(double Arg1, double Arg2, double Arg3);public double Gamma_Inv (double Arg1, double Arg2, double Arg3);Public Function Gamma_Inv (Arg1 As Double, Arg2 As Double, Arg3 As Double) As DoubleParameters
- Arg1
- Double
Probability - the probability associated with the gamma distribution.
- Arg2
- Double
Alpha - a parameter to the distribution.
- Arg3
- Double
Beta - a parameter to the distribution. If beta = 1, Gamma_Inv returns the standard gamma distribution.
Returns
Remarks
You can use this function to study a variable whose distribution may be skewed.
If any argument is text, Gamma_Inv returns the #VALUE! error value.
If probability < 0 or probability > 1, Gamma_Inv returns the #NUM! error value.
If alpha ≤ 0 or if beta ≤ 0, Gamma_Inv returns the #NUM! error value.
Given a value for probability, Gamma_Inv seeks that value x such that GAMMA_DIST(x, alpha, beta, TRUE) = probability. Thus, precision of Gamma_Inv depends on precision of Gamma_Dist(Double, Double, Double, Boolean). Gamma_Inv uses an iterative search technique. If the search has not converged after 100 iterations, the function returns the #N/A error value.