inverseCumulativeProbability method
The Inverse Cumulative Distribution Function (PPT), or quantile function.
Returns the value of x
for which the cumulative probability density is
p
. Throws InvalidProbability, if p
is out of range.
Implementation
@override
double inverseCumulativeProbability(num p) {
InvalidProbability.check(p);
var x = ibetaInv(2 * min(p, 1 - p), 0.5 * dof, 0.5);
x = sqrt(dof * (1 - x) / x);
return p > 0.5 ? x : -x;
}