# 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