(PECL stats >= 1.0.0)
stats_cdf_poisson — Calculates any one parameter of the Poisson distribution given values for the others
$par1
, float $par2
, int $which
) : float
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 cumulative 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 |
par1The first parameter
par2The second parameter
whichThe flag to determine what to be calculated
Returns CDF, x, or lambda, determined by which.