WorksheetFunction.BetaInv Method
| Excel Developer Reference |
Returns the inverse of the cumulative distribution function for a specified beta distribution. That is, if probability = BetaDist(x,...), then BetaInv(probability,...) = x.
Syntax
expression.BetaInv(Arg1, Arg2, Arg3, Arg4, Arg5)
expression A variable that represents a WorksheetFunction object.
Parameters
| Name | Required/Optional | Data Type | Description |
|---|---|---|---|
| Arg1 | Required | Double | A probability associated with the beta distribution. |
| Arg2 | Required | Double | The Alpha parameter of the distribution. |
| Arg3 | Required | Double | The Beta parameter the distribution. |
| Arg4 | Optional | Variant | An optional lower bound to the interval of x. |
| Arg5 | Optional | Variant | An optional upper bound to the interval of x. |
Return Value
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, BetaInv generates an error value.
- If alpha ≤ 0 or beta ≤ 0, BetaInv generates an error value.
- If probability ≤ 0 or probability > 1, BetaInv generates an error value.
- If you omit values for A and B, BetaInv uses the standard cumulative beta distribution, so that A = 0 and B = 1.
Given a value for probability, BetaInv seeks that value x such that BetaDist(x, alpha, beta, A, B) = probability. Thus, precision of BetaInv depends on precision of BetaDist. BetaInv uses an iterative search technique. If the search has not converged after 100 iterations, the function generates an error value.
See Also