W3cubDocs

/PHP

stats_dens_pmf_poisson

(PECL stats >= 1.0.0)

stats_dens_pmf_poissonProbability mass function of the Poisson distribution

Description

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.

Parameters

x

The value at which the probability mass is calculated

lb

The parameter of the Poisson distribution

Return Values

The probability mass at x or false for failure.

© 1997–2020 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.stats-dens-pmf-poisson.php