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

# stats_cdf_negative_binomial

(PECL stats >= 1.0.0)

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

### Description

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

Returns the cumulative distribution function, its inverse, or one of its parameters, of the negative 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, r, and p denotes cumulative distribution function, the number of failure, the number of success, and the success rate for each trial, respectively.

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

### Parameters

`par1`

  The first parameter

`par2`

  The second parameter

`par3`

  The third parameter

`which`

  The flag to determine what to be calculated

### Return Values

Returns CDF, x, r, or p, determined by `which`.

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