ncchisqp

double ncchisqp(double x, double v, double delta);

Returns the value of Non-central Chi-square random variable distribution function with v degrees of freedom and non-centrality parameter delta at the value x.

Parameters:
xCritical point.
vDegrees of freedom.
deltaNon-centrality parameter

Returns:
P(X ≤ x | v, delta)

Errors:
NUMERICS_ERROR is raised if v ≤ 0 or delta < 0

Usage:
double p = ncchisqp(.5, 1.5, 2.75)

Header:
#include "noncdist.h"