# stats_cdf_noncentral_t

(PECL stats >= 1.0.0)

stats_cdf_noncentral_t — Calculates any one parameter of the non-central t-distribution give values for the others

### 说明

stats_cdf_noncentral_t ( float `$par1` , float `$par2` , float `$par3` , int `$which` ) : float

Returns the cumulative distribution function, its inverse, or one of its parameters, of the non-central t-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, nu, and mu denotes cumurative distribution function, the value of the random variable, the degrees of freedom and the non-centrality parameter of the distribution, respectively.

Return value and parameters
`which` | Return value | `par1` | `par2` | `par3`
--- | --- | --- | --- | ---
1 | CDF | x | nu | mu
2 | x | CDF | nu | mu
3 | nu | x | CDF | mu
4 | mu | x | CDF | nu

### 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, nu, or mu, determined by `which`.