stats_dens_f
(PECL stats >= 1.0.0)
stats_dens_f — Probability density function of the F distribution
说明
stats_dens_f (
float
$x
,
float $dfr1
,
float $dfr2
) :
float
Returns the probability density at x
, where the random variable follows the F distribution of which the degree of freedoms are dfr1
and dfr2
.
参数
-
x
-
The value at which the probability density is calculated
-
dfr1
-
The degree of freedom of the distribution
-
dfr2
-
The degree of freedom of the distribution
返回值
The probability density at x
or FALSE
for failure.