Apple iWork '09 - Manual (Page 259)

Chapter 10 Statistical Functions 259
GAMMADIST
The GAMMADIST function returns the gamma distribution in the specified form.
GAMMADIST(non-neg-x-value, alpha, beta, form-type)
 non-neg-x-value: The value at which you want to evaluate the function. non-neg-x-
value is a number value that must be greater than or equal to 0.
 alpha: One of the shape parameters of the distribution. alpha is a number value
and must be greater than 0.
 beta: One of the shape parameters of the distribution. beta is a number value and
must be greater than 0.
 form-type: A value that indicates which form of the exponential function to provide.
cumulative form (TRUE or 1): Return the value of the cumulative distribution
function form.
probability density form (FALSE or 0): Return the value of the probability density
function form.
Examples
=GAMMADIST(0.8, 1, 2, 1) returns 0.329679953964361 (the cumulative distribution form).
=GAMMADIST(0.8, 1, 2, 0) returns 0.33516002301782 (the probability density form).
Related Topics
For related functions and additional information, see:
“GAMMAINV” on page 260
“GAMMALN” on page 260
“Listing of Statistical Functions” on page 225
“Value Types” on page 36
“The Elements of Formulas” on page 15
“Using the Keyboard and Mouse to Create and Edit Formulas” on page 26
“Pasting from Examples in Help” on page 41