stats_cdf_gamma
(PECL stats >= 1.0.0)
stats_cdf_gamma — Calculates any one parameter of the gamma distribution given values for the others
说明
$par1
, float $par2
, float $par3
, int $which
) : float
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.
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.