stats_rand_gen_f

(PECL stats >= 1.0.0)

stats_rand_gen_f — Generates a random deviate from the F distribution

说明

stats_rand_gen_f ( float $dfn , float $dfd ) : float

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.

参数

dfn: The degrees of freedom in the numerator
dfd: The degrees of freedom in the denominator

返回值

A random deviate