stats_dens_pmf_negative_binomial

(PECL stats >= 1.0.0)

stats_dens_pmf_negative_binomial — Probability density function of the negative binomial distribution

Description

float stats_dens_pmf_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.

Parameters

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

Return Values

The probability density at x or FALSE for failure.