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(PECL stats >= 1.0.0)
stats_rand_gen_f — Generates a random deviate
$dfn
, float $dfd
)Generates a random deviate from the F (variance ratio) distribution with "dfn" degrees of freedom in the numerator and "dfd" degrees of freedom in the denominator. Method : directly generates ratio of chisquare variates.
dfn
dfd