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.