Probabilities.FCDF Function

F cumulative distribution function (CDF).

Pascal

function FCDF(x: double; Nu1: Integer; Nu2: Integer): double; overload;

Parameters	Description
x	Distribution domain, real positive value or zero.
Nu1	Defines distribution degrees of freedom. Nu1 must be a positive integer.
Nu2	Defines distribution degrees of freedom. Nu2 must be a positive integer.

Returns

the F cumulative distribution function (CDF) for integer parameters Nu1 and Nu2 at the value X. Both Nu1 and Nu2 must be positive integer numbers, otherwise the result is NAN.

Description

The F cumulative distribution function is defined by the following equation:

where n1=Nu1 and n2=Nu2 are degrees of freedom, and Gamma is the Math387.Gamma function. The result of FCDF is the probability that a single observation from an F distribution with parameters Nu1 and Nu2 will fall in the interval [0,x].