/** {@inheritDoc} */
@Override
public double cumulativeProbability(double x) throws MathException {
if (x <= 0) {
return 0;
} else if (x >= 1) {
return 1;
} else {
return Beta.regularizedBeta(x, alpha, beta);
}
}
public double cdf(double x) {
double r = -1 * (mean * mean) / (mean - stdev * stdev);
double p = mean / (stdev * stdev);
try {
return Beta.regularizedBeta(p, r, x + 1);
} catch (MathException e) {
// AR - throwing exceptions deep in numerical code causes trouble. Catching runtime
// exceptions is bad. Better to return NaN and let the calling code deal with it.
return Double.NaN;
// throw MathRuntimeException.createIllegalArgumentException(
// "Couldn't calculate beta cdf for alpha = " + alpha + ", beta = " + beta + ":
// " +e.getMessage());
}
}
