Returns the inverse function of the gamma cumulative distribution function. If P = GAMMADIST(x,…) , then GAMMAINV(p,…) = x.
Use this function to study variables that may have skewed distributions.
grammar
GAMMAINV(probability,alpha,beta)
Probability The probability associated with the gamma distribution.
Alpha distribution parameters.
Beta distribution parameters. If beta = 1, GAMMAINV returns the standard gamma distribution.
Instructions
If any of the arguments is non-numeric, GAMMAINV returns the #VALUE! Error. .
If probability
If alpha ≤ 0 or beta ≤ 0, GAMMAINV returns the #NUM! Error value .
If a probability value is given, GAMMAINV solves for the value x using GAMMADIST(x, alpha, beta, TRUE) = probability.
Therefore, the accuracy of the GAMMAINV depends on the accuracy of the GAMMADIST. GAMMAINV uses an iterative search technique.
If the search does not converge after 100 iterations, the function returns the error value #N/A.
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