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