MathPHP\Statistics\Significance::sem PHP Méthode

Used in the Z test. https://en.wikipedia.org/wiki/Standard_error σ SEM = -- √n

public static sem ( number $σ, integer $n ) : float
$σ	number	Population standard deviation
$n	integer	Sample size (number of observations of the sample)
Résultat	float

    public static function sem($σ, $n)
    {
        return $σ / sqrt($n);
    }

Significance