International PHP Conference Berlin 2025

    stats_dens_pmf_poisson

    (PECL stats >= 1.0.0)

    stats_dens_pmf_poisson — Probability 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.

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