stats_dens_negative_binomial
(PECL stats >= 1.0.0)
stats_dens_negative_binomial — Probability density function of the negative binomial distribution
说明
float stats_dens_negative_binomial
( float
$x
, float $n
, float $pi
)
Returns the probability density at x, where the
random variable follows the negative binomial distribution of which the number of the success
is n and the success rate is pi.
参数
-
x -
The value at which the probability density is calculated
-
n -
The number of the success of the distribution
-
pi -
The success rate of the distribution
返回值
The probability density at x or FALSE for failure.
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