stats_dens_chisquare
(PECL stats >= 1.0.0)
stats_dens_chisquare — Probability density function of the chi-square distribution
说明
stats_dens_chisquare
( float
$x
, float $dfr
) : float
Returns the probability density at x, where the
random variable follows the chi-square distribution of which the degree of
freedom is dfr.
参数
-
x -
The value at which the probability density is calculated
-
dfr -
The degree of freedom of the distribution
返回值
The probability density at x or FALSE for failure.