ncbetap

double ncbetap(double x, double a, double b, double lambda);

Returns the value of Non-central Beta random variable distribution function with alpha a, beta b, and non-centrality parameter lambda at the value x.

Parameters:
xCritical point.
aAlpha shape parameter
bBeta shape parameter
lambdaNon-centralilty parameter.

Returns:
P(X ≤ x | a, b, lambda)

Errors:
NUMERICS_ERROR is raised if a ≤ 0, b ≤, or lambda ≤ 0

Usage:
double p = ncbetap(.5, 1.5, 2.75, 0.3)

Header:
#include "noncdist.h"