stats_dens_pmf_poisson

(PECL stats >= 1.0.0)

stats_dens_pmf_poisson — Probability mass function of the Poisson distribution

说明

stats_dens_pmf_poisson ( float $x , float $lb ) : float

Returns the probability mass at x, where the random variable follows the Poisson distribution whose parameter is lb.

参数

x

The value at which the probability mass is calculated

lb

The parameter of the Poisson distribution

返回值

The probability mass at x or FALSE for failure.

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