stats_dens_pmf_negative_binomial

    (PECL stats >= 1.0.0)

    stats_dens_pmf_negative_binomial — Probability mass function of the negative binomial distribution

    说明

    stats_dens_pmf_negative_binomial(float $x, float $n, float $pi): float

    Returns the probability mass at x, where the random variable follows the negative binomial distribution of which the number of the success is n and the success rate is pi.

    参数

    x

    The value at which the probability mass is calculated

    n

    The number of the success of the distribution

    pi

    The success rate of the distribution

    返回值

    The probability mass at x or false for failure.

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