### GAMMAINV(probability, alpha, beta)

Returns the probability of getting greater than a particular value in a gamma distribution.

 probability The probability associated with the gamma distribution. alpha The first parameter to the distribution. beta The second parameter to the distribution.

#### Remarks

 * GAMMA.INV was added in Excel 2010 to replace this function.* The gamma distribution is a continuous distribution.* If "probability" < 0, then #NUM! is returned.* If "probability" > 1, then #NUM! is returned.* If "probability" is not numeric, then #VALUE! is returned.* If "alpha" = 0, then #NUM! is returned.* If "alpha" is not numeric, then #VALUE! is returned.* If "beta" = 0, then #NUM! is returned.* If "beta" = 1, then the standard gamma distribution is used ??* If "beta" = 0, then #NUM! is returned.* If "beta" is not numeric, then #VALUE! is returned.* This function uses an iterative technique for calculating the function.* This function iterates until the result is accurate to within ±3x10^-7.* If this function does not converge after 100 iterations, then #N/A is returned.* In Excel 2010 the accuracy of this function was improved.* For the Microsoft documentation refer to support.office.com

 A 1 =GAMMAINV(0.068094,9,2) = 10.00 2 =GAMMAINV(0.5,4,2) = 7.34 3 =GAMMAINV(0.068,4,2) = 3.04 4 =GAMMAINV(GAMMADIST(7,5,1,TRUE),5,1) = 7.00 5 =GAMMAINV(GAMMADIST(0.5,4,2,TRUE),4,2) = 0.50 6 =GAMMAINV(0.5,4,2) = 7.34 7 =GAMMAINV(0.5,-9,2) = #NUM! 8 =GAMMAINV(-2,9,2) = #NUM! 9 =GAMMAINV(-2,"some text",2) = #VALUE!