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Corrected variance (Thanks Thomas) and added tests for inverseCumulativeProbability

This commit is contained in:
Ole 2014-10-10 17:24:57 -05:00
parent 4cb944ea68
commit 0dec6e76fb
1 changed files with 20 additions and 1 deletions
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21
src/test/java/org/apache/commons/math3/distribution/AbstractIntegerDistributionTest.java
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@ -27,6 +27,25 @@ public class AbstractIntegerDistributionTest {
protected final DiceDistribution diceDistribution = new DiceDistribution();
protected final double p = diceDistribution.probability(1);
@Test
public void testInverseCumulativeProbabilityMethod()
{
double precision = 0.000000000000001;
Assert.assertEquals(1, diceDistribution.inverseCumulativeProbability(0));
Assert.assertEquals(1, diceDistribution.inverseCumulativeProbability((1d-Double.MIN_VALUE)/6d));
Assert.assertEquals(2, diceDistribution.inverseCumulativeProbability((1d+precision)/6d));
Assert.assertEquals(2, diceDistribution.inverseCumulativeProbability((2d-Double.MIN_VALUE)/6d));
Assert.assertEquals(3, diceDistribution.inverseCumulativeProbability((2d+precision)/6d));
Assert.assertEquals(3, diceDistribution.inverseCumulativeProbability((3d-Double.MIN_VALUE)/6d));
Assert.assertEquals(4, diceDistribution.inverseCumulativeProbability((3d+precision)/6d));
Assert.assertEquals(4, diceDistribution.inverseCumulativeProbability((4d-Double.MIN_VALUE)/6d));
Assert.assertEquals(5, diceDistribution.inverseCumulativeProbability((4d+precision)/6d));
Assert.assertEquals(5, diceDistribution.inverseCumulativeProbability((5d-precision)/6d));//Can't use Double.MIN
Assert.assertEquals(6, diceDistribution.inverseCumulativeProbability((5d+precision)/6d));
Assert.assertEquals(6, diceDistribution.inverseCumulativeProbability((6d-precision)/6d));//Can't use Double.MIN
Assert.assertEquals(6, diceDistribution.inverseCumulativeProbability((6d)/6d));
}
@Test
public void testCumulativeProbabilitiesSingleArguments() {
for (int i = 1; i < 7; i++) {
@ -90,7 +109,7 @@ public class AbstractIntegerDistributionTest {
}
public double getNumericalVariance() {
return 12.5 - 3.5 * 3.5; // E(X^2) - E(X)^2
return 70/24; // E(X^2) - E(X)^2
}
public int getSupportLowerBound() {