PHP マニュアル: Probability mass function of the hypergeometric distribution

説明

float stats_dens_pmf_hypergeometric(
    float $n1,
    float $n2,
    float $N1,
    float $N2
)

Returns the probability mass at n1, where the random variable follows the hypergeometric distribution of which the number of failure is n2, the number of success samples is N1, and the number of failure samples is N2.

パラメータ

n1: The number of success, at which the probability mass is calculated
n2: The number of failure of the distribution
N1: The number of success samples of the distribution
N2: The number of failure samples of the distribution

戻り値

The probability mass at n1 or false for failure.