stats_dens_pmf_poisson

(PECL stats >= 1.0.0)

stats_dens_pmf_poisson — Probability mass function of the Poisson distribution

Beschreibung

function 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.

Parameter-Liste

x
The value at which the probability mass is calculated
lb
The parameter of the Poisson distribution

Rückgabewerte

The probability mass at x or false for failure.