The GAMMA.INV function returns the inverse of the gamma cumulative distribution.
If p = GAMMA.DIST(x…), then GAMMA.INV (p…) = x. You can use this Function to study a variable whose distribution may be skewed.
Syntax:= GAMMAINV(probability,alpha,beta)
The GAMMA.INV 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, GAMMA.INV returns the standard gamma distribution.
Example: Let’s look at some Excel GAMMA.INV function examples and explore how to use the GAMMA.INV function as a worksheet function in Microsoft Excel:
Syntax: =GAMMA.INV(B1,B2,B3)
Result: 3.037221607
Note:
- 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.
