Statistic 函数
PHP Manual

stats_cdf_gamma

(PECL stats >= 1.0.0)

stats_cdf_gammaCalculates any one parameter of the gamma distribution given values for the others.

说明

float stats_cdf_gamma ( float $par1 , float $par2 , float $par3 , int $which )

Returns the cumulative distribution function, its inverse, or one of its parameters, of the gamma distribution. The kind of the return value and parameters (par1, par2, and par3) are determined by which.

The following table lists the return value and parameters by which. CDF, x, k, and theta denotes cumurative distribution function, the value of the random variable, and the shape and the scale parameter of the gamma distribution, respectively.

Return value and parameters
which Return value par1 par2 par3
1 CDF x k theta
2 x CDF k theta
3 k x CDF theta
4 theta x CDF k

参数

par1

The first parameter

par2

The second parameter

par3

The third parameter

which

The flag to determine what to be calculated

返回值

Returns CDF, x, k, or theta, determined by which.


Statistic 函数
PHP Manual