GAMMADIST(x, alpha, beta, cumulative)

Returns the probability distribution function OR the cumulative probability function for a gamma distribution.

 x The number from the distribution. alpha The first parameter to the distribution. beta The second parameter to the distribution. cumulative A logical value indicating the type of function to use:False (or 0) = [[probability distribution function]] (equal to)True (<> 0) = [[cumulative probability function]] (equal to or less than)

 REMARKS
 * GAMMA.DIST was added in Excel 2010 to replace this function.* The gamma distribution is a [[continuous distribution]]* If "x" < 0, then #NUM! is returned.* If "x" 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" = 1, then the standard gamma distribution is used.* If "beta" = 0, then #NUM! is returned.* If "beta" is not numeric, then #VALUE! is returned.* The "cumulative" argument is not optional.* If "cumulative" = False, then the height of the curve at "x" is returned.* If "cumulative" = True, then the area under the curve to the left of "x" is returned.* This function is also known as the Erlang distribution, when "alpha" is a positive integer.* You can use the GAMMA.INV function to* You can use the GAMMA function to* You can use the BETA.INV function to* For the Microsoft documentation refer to support.microsoft.com

 A 1 =GAMMADIST(10, 9, 2, FALSE) = 0.033 2 =GAMMADIST(10, 9, 2, TRUE) = 0.068 3 =GAMMADIST(10, 10, 5, TRUE) = 0 4 =GAMMADIST(7, 5, 1, TRUE) = 1 5 =GAMMADIST(GAMMAINV(0.5, 4, 2), 4, 2, TRUE) = 1 6 =GAMMADIST(10, 9, 0, TRUE) = #NUM! 7 =GAMMADIST(10, -2, 2, TRUE) = #NUM! 8 =GAMMADIST(-1, 9, 2, TRUE) = #NUM! 9 =GAMMADIST(-1, "some text", 2, TRUE) = #VALUE! 10 =GAMMADIST(-1, 9, 2, "some text") = #VALUE!

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