GAMMADIST(x, alpha, beta)

The GAMMADIST function calculates the gamma distribution. It is used when working with variables that may have a skewed distribution. x is the value at which the function is to be evaluated; alpha and beta are parameters to the function. The formula for the gamma distribution is:

image\ebx_-1106576637.gif

and for the standard gamma distribution, that is when b = 1, is:

image\ebx_1828610647.gif

For example:

GAMMADIST(15, 7, 4)

returns 0.022709.

See also:

Other statistical functions