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PHP Manual [stats_dens_pmf_poisson]

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PHP Manual || Statistic Functions

(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.



PHP Manual || Statistic Functions