Q_chi2

Complementary probability integral for Cauchy distribution.

Loading LOADSUB ALL FROM "IGAMMA.HTS"

or LOADSUB FROM "MATHLIB.HTS"

Usage INTEGER N

REAL X,Y

Y=FNQ_chi2(N,X)

Description

FNQ_chi2 returns the value of the complementary probability integral of the univariate chi-squared (χ²) probability density function with parameter n. This integral, Q(x;n), is defined by the expression

X is often written as χ²; among other uses, this notation emphasizes the fact that this integral is only less than one for values of x ≥ 0. Although Q is sometimes defined for n < 0, most implementations, including this one, restrict Q to being defined for n ≥ 0.

Q(x;n)

Errors

FNQ_chi2 causes an HTBasic error if its arguments are not of the types listed in the USAGE section, above, or if n is negative.

See Also

F_chi2, P_chi2