PHP マニュアル: Probability density function of the logistic distribution

説明

float stats_dens_logistic(float $x, float $ave, float $stdev)

Returns the probability density at x, where the random variable follows the logistic distribution of which the location parameter is ave and the scale parameter is stdev.

パラメータ

x: The value at which the probability density is calculated
ave: The location parameter of the distribution
stdev: The shape parameter of the distribution

戻り値

The probability density at x or false for failure.