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15.5.253 fratio

fratio(f, nu1, nu2 [, /complement, /log])

The f-test distribution. Returns the probability of exceeding variance ratio f for nu1 and nu2 degrees of freedom, or one minus this number if /complement is specified. Minus one is returned for illegal parameter combinations. If /log is specified, then the natural logarithm of the result is returned instead.

See also: erf, erfc, chi2, student, ibeta.