stats_dens_pmf_negative_binomial

(PECL stats >= 1.0.0)

stats_dens_pmf_negative_binomial — Probability density function of the negative binomial distribution

Description

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.

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https://secure.php.net/manual/en/function.stats-dens-pmf-negative-binomial.php