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Compatibility - GAMMAINV Function
The GAMMAINV function replaces the GAMMA.INV function in Excel 2010.
Description
The function returns the inverse of the gamma cumulative distribution.
If p = GAMMADIST(x,...), then GAMMAINV(p,...) = x
You can use this function to study a variable whose distribution may be skewed.
Syntax
GAMMAINV (probability,alpha,beta)
Arguments
| Argument | Description | Required/ Optional |
|---|---|---|
| Probability | The probability associated with the gamma distribution. | Required |
| Alpha | A parameter to the distribution. | Required |
| Beta | A parameter to the distribution. If beta = 1, GAMMAINV returns the standard gamma distribution. |
Required |
Notes
If any argument is text, GAMMAINV returns the #VALUE! error value.
If probability < 0 or probability > 1, GAMMAINV returns the #NUM! error value.
If alpha ≤ 0 or if beta ≤ 0, GAMMAINV returns the #NUM! error value.
Given a value for probability, GAMMAINV seeks that value of x such that GAMMADIST(x, alpha, beta, TRUE) = probability. Hence, precision of GAMMAINV depends on precision of GAMMADIST. GAMMAINV uses an iterative search technique. If the search has not converged after 100 iterations, the function returns the #N/A error value.
Example
