WorksheetFunction.Gamma_Inv(Double, Double, Double) Method

Reference

Definition

Namespace:: Microsoft.Office.Interop.Excel

Assembly:: Microsoft.Office.Interop.Excel.dll

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 Double

Parameters

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

Double

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.

Applies to