Function chiSquareCDF
χ,2 distribution function and its complement.
double chiSquareCDF
(
double x,
double v
);
Returns the area under the left hand tail (from 0 to x) of the Chi square probability density function with v degrees of freedom. The complement returns the area under the right hand tail (from x to ∞).
chiSquareCDF(x | v) = (0, x t, v/2-1 e, -t/2 dt ) / 2, v/2 (v/2)
chiSquareCDFR(x | v) = (x, ∞ t, v/2-1 e, -t/2 dt ) / 2, v/2 (v/2)
Parameters
| Name | Description |
|---|---|
| v | degrees of freedom. Must be positive. |
| x | the χ,2 variable. Must be positive. |