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Probabilities.ChiSquareCDF Function
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Chi-squared cumulative distribution Function (CDF).

Pascal
function ChiSquareCDF(x: double; Nu: Integer): double; overload;
File
Parameters
Parameters 
Description 
x 
Function domain, real positive value. 
Nu 
Defines distribution degrees of freedom. Nu must be a positive integer value. 
Returns

the chi-squared cumulative distribution Function (CDF). The parameter Nu (degrees of freedom) must be a positive integer, otherwise the result is NAN.

Description

The chi-squared cumulative distribution function is defined by the following equation: 

 

where n (Nu) is the degrees of freedom and G is gamma function. The result of ChiSquareCDF is the probability that a single observation from the chi-squared distribution with Nu degrees of freedom will fall in the interval [0,x].

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