stats_cdf_normal
(PECL stats >= 1.0.0)
stats_cdf_normal — Calculates any one parameter of the normal distribution given values for the others
说明
stats_cdf_normal (
float
$par1 ,
float $par2 ,
float $par3 ,
int $which ) :
float
Returns the cumulative distribution function, its inverse, or one of its parameters, of the normal 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, mu, and sigma denotes cumulative distribution function, the value of the random variable, the mean and the standard deviation of the normal distribution, respectively.
which |
Return value | par1 |
par2 |
par3 |
|---|---|---|---|---|
| 1 | CDF | x | mu | sigma |
| 2 | x | CDF | mu | sigma |
| 3 | mu | x | CDF | sigma |
| 4 | sigma | x | CDF | mu |
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, mu, or sigma, determined by which.
