/** Verify that if there are no successes, mass is concentrated on 0 */
public void testDegenerateNoSuccesses() throws Exception {
setDistribution(DistributionFactory.newInstance().createHypergeometricDistribution(5, 0, 3));
setCumulativeTestPoints(new int[] {-1, 0, 1, 3, 10});
setCumulativeTestValues(new double[] {0d, 1d, 1d, 1d, 1d});
setDensityTestPoints(new int[] {-1, 0, 1, 3, 10});
setDensityTestValues(new double[] {0d, 1d, 0d, 0d, 0d});
setInverseCumulativeTestPoints(new double[] {0.1d, 0.5d});
setInverseCumulativeTestValues(new int[] {-1, -1});
verifyDensities();
verifyCumulativeProbabilities();
verifyInverseCumulativeProbabilities();
}
/**
* Create a Chi-Squared distribution with the given degrees of freedom.
*
* @param degreesOfFreedom degrees of freedom.
*/
public ChiSquaredDistributionImpl(double degreesOfFreedom) {
super();
setGamma(
DistributionFactory.newInstance().createGammaDistribution(degreesOfFreedom / 2.0, 2.0));
}
/** Creates the default discrete distribution instance to use in tests. */
public IntegerDistribution makeDistribution() {
return DistributionFactory.newInstance().createHypergeometricDistribution(10, 5, 5);
}
