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[MATH-644] added unit test. 

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1344943 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Thomas Neidhart 2012-05-31 23:55:12 +00:00
parent 8ed5527ee0
commit 47635bdb4a
1 changed files with 18 additions and 0 deletions
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18
src/test/java/org/apache/commons/math3/distribution/HypergeometricDistributionTest.java
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@ -21,6 +21,7 @@ import org.apache.commons.math3.TestUtils;
import org.apache.commons.math3.exception.NotPositiveException;
import org.apache.commons.math3.exception.NotStrictlyPositiveException;
import org.apache.commons.math3.exception.NumberIsTooLargeException;
import org.apache.commons.math3.util.Precision;
import org.junit.Assert;
import org.junit.Test;
@ -266,4 +267,21 @@ public class HypergeometricDistributionTest extends IntegerDistributionAbstractT
Assert.assertEquals(dist.getNumericalMean(), 55d * 200d / 3000d, tol);
Assert.assertEquals(dist.getNumericalVariance(), ( 200d * 55d * (3000d - 200d) * (3000d - 55d) ) / ( (3000d * 3000d * 2999d) ), tol);
}
@Test
public void testMath644() {
int N = 14761461; // population
int m = 1035; // successes in population
int n = 1841; // number of trials
int k = 0;
final HypergeometricDistribution dist = new HypergeometricDistribution(N, m, n);
Assert.assertTrue(Precision.compareTo(1.0, dist.upperCumulativeProbability(k), 1) == 0);
Assert.assertTrue(Precision.compareTo(dist.cumulativeProbability(k), 0.0, 1) > 0);
// another way to calculate the upper cumulative probability
double upper = 1.0 - dist.cumulativeProbability(k) + dist.probability(k);
Assert.assertTrue(Precision.compareTo(1.0, upper, 1) == 0);
}
}