stats_cdf_poisson
stats_cdf_poisson
(PECL stats >= 1.0.0)
stats_cdf_poisson — Calculates any one parameter of the Poisson distribution given values for the others.
Description
float stats_cdf_poisson ( float $par1 , float $par2 , int $which )
Returns the cumulative distribution function, its inverse, or one of its parameters, of the Poisson distribution. The kind of the return value and parameters (par1 and par2) are determined by which.
The following table lists the return value and parameters by which. CDF, x, and lambda denotes cumurative distribution function, the value of the random variable, and the parameter of the Poisson distribution, respectively.
| which | Return value | par1 | par2 |
|---|---|---|---|
| 1 | CDF | x | lambda |
| 2 | x | CDF | lambda |
| 3 | lambda | x | CDF |
Parameters
par1
The first parameter
par2
The second parameter
which
The flag to determine what to be calculated
Return Values
Returns CDF, x, or lambda, determined by which.
← stats_cdf_normal
stats_cdf_t →
© 1997–2017 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://secure.php.net/manual/en/function.stats-cdf-poisson.php
