stats_dens_pmf_negative_binomial
(PECL stats >= 1.0.0)
stats_dens_pmf_negative_binomial — Probability mass function of the negative binomial distribution
Description
stats_dens_pmf_negative_binomial ( float $x , float $n , float $pi ) : float
Returns the probability mass 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 mass is calculated
-
n -
The number of the success of the distribution
-
pi -
The success rate of the distribution
Return Values
The probability mass at x or false for failure.
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https://www.php.net/manual/en/function.stats-dens-pmf-negative-binomial.php