Documentation/How Tos/Calc: BETADIST function

BETADIST

Calculates the cumulative distribution function of a beta distribution.

Syntax:

BETADIST(n; α; β; a; b)

The beta distribution is a family of continuous probability distributions, defined for an interval a to b, where α and β are parameters controlling the shape of the distribution. n lies between a and b.

BETADIST calculates the cumulative distribution function F(x; α, β) = I_x(α, β) where x = (n-a)/(b-a) and I_x(α, β) is the regularised incomplete beta function.

a and b are optional parameters which default (if omitted) to 0 and 1.

Example:

BETADIST(0.75; 3; 4)

returns approximately 0.96.

See also:

BETAINV

Statistical functions