WorksheetFunction.Beta_Inv(Double, Double, Double, Object, Object) Method

Definition

Namespace:

Microsoft.Office.Interop.Excel

Assembly:

Microsoft.Office.Interop.Excel.dll

Returns the inverse of the cumulative distribution function for a specified beta distribution. That is, if probability = Beta_Dist(x,...), then Beta_Inv(probability,...) = x.

public double Beta_Inv (double Arg1, double Arg2, double Arg3, object Arg4, object Arg5);

Public Function Beta_Inv (Arg1 As Double, Arg2 As Double, Arg3 As Double, Optional Arg4 As Object, Optional Arg5 As Object) As Double

Parameters

Arg1

Double

A probability associated with the beta distribution.

Arg2

Double

The Alpha parameter of the distribution.

Arg3

Double

The Beta parameter the distribution.

Arg4

Object

An optional lower bound to the interval of x.

Arg5

Object

An optional upper bound to the interval of x.

Returns

Double

Remarks

The beta distribution can be used in project planning to model probable completion times given an expected completion time and variability:

• If any argument is nonnumeric, Beta_Inv generates an error value.
• If alpha ≤ 0 or beta ≤ 0, Beta_Inv generates an error value.
• If probability ≤ 0 or probability > 1, Beta_Inv generates an error value.
• If you omit values for A and B (lower and upper bound), Beta_Inv uses the standard cumulative beta distribution, so that A = 0 and B = 1.

Given a value for probability, Beta_Inv seeks that value x such that Beta_Dist(x, alpha, beta, TRUE, A, B) = probability. Thus, precision of Beta_Inv depends on precision of Beta_Dist(Double, Double, Double, Boolean, Object, Object). Beta_Inv uses an iterative search technique.