# stats_cdf_binomial

(PECL stats >= 1.0.0)

stats_cdf_binomial — Calculates any one parameter of the binomial distribution given values for the others

### 说明

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

Returns the cumulative distribution function, its inverse, or one of its parameters, of the binomial 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, n, and p denotes cumurative distribution function, the number of successes, the number of trials, and the success rate for each trial, respectively.

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

### 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, n, or p, determined by `which`.