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GAMMAINV

Definition

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.

Sample Usage

Syntax

GAMMAINV(probability,alpha,beta)

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.

Remarks

  • 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:




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