(PECL stats >= 1.0.0)
stats_cdf_noncentral_chisquare — Calculates any one parameter of the non-central chi-square distribution given values for the others.
$par1
, float $par2
, float $par3
, int $which
)
Returns the cumulative distribution function, its inverse, or one of its parameters,
of the non-central chi-square 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, k, and lambda denotes cumurative distribution function, the value of the random
variable, the degree of freedom and the non-centrality parameter of the distribution,
respectively.
which |
Return value | par1 |
par2 |
par3 |
|---|---|---|---|---|
| 1 | CDF | x | k | lambda |
| 2 | x | CDF | k | lambda |
| 3 | k | x | CDF | lambda |
| 4 | lambda | x | CDF | k |
par1The first parameter
par2The second parameter
par3The third parameter
whichThe flag to determine what to be calculated
Returns CDF, x, k, or lambda, determined by which.