PHP Manual
Statistic 函数
Probability density function of the chi-square distribution

stats_dens_chisquare

(PECL stats >= 1.0.0)

stats_dens_chisquare — Probability density function of the chi-square distribution

说明

stats_dens_chisquare ( float $x , float $dfr ) : float

Returns the probability density at x, where the random variable follows the chi-square distribution of which the degree of freedom is dfr.

参数

x: The value at which the probability density is calculated
dfr: The degree of freedom of the distribution

返回值

The probability density at x or FALSE for failure.

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