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CHI_SQUARE(x,k) returns the value of the cumulative distribution function F(x,k) for the argument value x and k degrees of freedom. The CHI_SQUARE cumulative distribution function is formally defined as
where g is the lower incomplete Gamma function and G is the Gamma function. The CHI_SQUARE function is further defined in Abramowitz and Stegun, "Handbook of Mathematical Functions", Dover Publications, 10th printing, 1972.
See also: GAMMA_