(PECL stats >= 1.0.0)
stats_dens_pmf_negative_binomial — Probability density function of the negative binomial distribution
$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.
xThe value at which the probability density is calculated
nThe number of the success of the distribution
piThe success rate of the distribution
The probability density at x or FALSE for failure.