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.
The GAMMAINV function syntax has the following arguments:
Probability Required. The probability associated with the gamma distribution.
Alpha Required. A parameter to the distribution.
Beta Required. A parameter to the distribution. If beta = 1, GAMMAINV returns the standard gamma distribution.
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 x such that GAMMADIST(x, alpha, beta, TRUE) = probability. Thus, 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.
In order to use the GAMMAINV formula, start with your edited Excellentable:
Then type in the GAMMAINV formula in the area you would like to display the outcome:
By adding the values you would like to calculate the GAMMAINV formula for, Excellentable will generate the outcome: