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Compatibility - BETAINV Function
The BETAINV function replaces the BETA.INV function from Excel 2010.
Description
The function returns the inverse of the cumulative beta probability density function for a specified beta distribution. i.e.
If probability = BETADIST(x...), then BETAINV (probability...) = x
The beta distribution can be used in project planning to model probable completion times given an expected completion time and variability.
Syntax
BETAINV (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 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, BETAINV uses the standard cumulative beta distribution, so that A = 0 and B = 1
If any argument is nonnumeric, BETAINV returns the #VALUE! error value.
If alpha ≤ 0 or beta ≤ 0, BETAINV returns the #NUM! error value.
If probability ≤ 0 or probability > 1, BETAINV returns the #NUM! error value.
Given a value for probability, BETAINV seeks that value x such that BETADIST(x, alpha, beta, A, B) = probability. Hence, precision of BETAINV depends on precision of BETADIST
Example
