PHP Manual
Statistic 函数
Probability density function of the logistic distribution

stats_dens_logistic

(PECL stats >= 1.0.0)

stats_dens_logistic — Probability density function of the logistic distribution

说明

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

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.

参数

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

返回值

The probability density at x or FALSE for failure.

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