MS Excel - Excel BETA.INV() function
Description
The BETA.INV() function is used to get 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.
Version: Excel 2013
Syntax
BETA.INV(probability,alpha,beta,[A],[B])
Parameters
| Name | Description | Data Type | Required/ Optional |
|---|---|---|---|
| Probability | A probability associated with the beta distribution. | number | Required |
| Alpha | A parameter of the distribution. | number | Required |
| Beta | A parameter of the distribution. | number | Required |
| A | A lower bound to the interval of x. | number | Optional |
| B | An upper bound to the interval of x. | number | Optional |
Remarks :
- 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 you omit values for A and B, 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.
Example : Excel BETA.INV() function
The following worksheet shows the inverse of the cumulative beta probability density function for the parameters present in sample data column in the table.
| Sample Data | Description |
|---|---|
| 0.69638061 | Probability associated with the beta distribution |
| 7 | Parameter of the distribution |
| 9 | Parameter of the distribution |
| 2 | Lower bound |
| 4 | Upper bound |
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