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Statistical - BETA.INV Function
Description
The BETA.INV function returns the inverse of the beta cumulative probability density function (BETA.DIST). If probability = BETA.DIST(x ...TRUE), then BETA.INV (probability...) = x.
The beta distribution can be used in project planning to model probable completion times given an expected completion time and variability.
Syntax
BETA.INV (probability,alpha,beta,[A],[B])
Arguments
| Argument | Description | Required/ Optional |
|---|---|---|
| Probability | A probability associated with the beta distribution. | Required |
| Alpha | A parameter of the distribution. | Required |
| Beta | A parameter of the distribution. | Required |
| A | A lower bound to the interval of x. | Optional |
| B | An upper bound to the interval of x. | Optional |
Notes
If you omit values for A and B, BETA.INV uses the standard cumulative beta distribution, so that A = 0 and B = 1
If any argument is nonnumeric, BETA.INV returns the #VALUE! error value.
If alpha ≤ 0 or beta ≤ 0, BETA.INV returns the #NUM! error value.
If probability ≤ 0 or probability > 1, BETA.INV returns the #NUM! error value.
If A and B are equal, BETA.INV returns the #NUM! error value.
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.
Applicability
Excel 2010, Excel 2013, Excel 2016
Example
