stats_dens_pmf_negative_binomial

(PECL stats >= 1.0.0)

stats_dens_pmf_negative_binomial — Probability density function of the negative binomial distribution

说明

stats_dens_pmf_negative_binomial ( float $x , float $n , float $pi ) : float

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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