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.
expression . Beta_Inv( Arg1 , Arg2 , Arg3 , Arg4 , Arg5 )
expression A variable that represents a WorksheetFunction object.
| 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. |
Double
The beta distribution can be used in project planning to model probable completion times given an expected completion time and variability:
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If any argument is nonnumeric, Beta_Inv generates an error value.
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If alpha ? 0 or beta ? 0, Beta_Inv generates an error value.
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If probability ? 0 or probability > 1, Beta_Inv generates an error value.
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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. Beta_Inv uses an iterative search technique.