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package org.apache.commons.math.stat.univariate;
import org.apache.commons.math.stat.univariate.moment.FourthMoment;
import org.apache.commons.math.stat.univariate.moment.Kurtosis;
import org.apache.commons.math.stat.univariate.moment.Mean;
import org.apache.commons.math.stat.univariate.moment.Skewness;
import org.apache.commons.math.stat.univariate.moment.Variance;
import junit.framework.TestCase;
/**
* @version $Revision: 1.7 $ $Date: 2003/11/14 22:22:23 $
*/
public class InteractionTest extends TestCase {
protected double mean = 12.40454545454550;
protected double var = 10.00235930735930;
protected double skew = 1.437423729196190;
protected double kurt = 2.377191264804700;
protected double tolerance = 10E-12;
protected double[] testArray =
{
12.5,
12,
11.8,
14.2,
14.9,
14.5,
21,
8.2,
10.3,
11.3,
14.1,
9.9,
12.2,
12,
12.1,
11,
19.8,
11,
10,
8.8,
9,
12.3 };
public InteractionTest(String name) {
super(name);
}
public void testInteraction() {
FourthMoment m4 = new FourthMoment();
Mean m = new Mean(m4);
Variance v = new Variance(m4);
Skewness s= new Skewness(m4);
Kurtosis k = new Kurtosis(m4);
for (int i = 0; i < testArray.length; i++){
m4.increment(testArray[i]);
m.increment(testArray[i]);
v.increment(testArray[i]);
s.increment(testArray[i]);
k.increment(testArray[i]);
}
assertEquals(mean,m.getResult(),tolerance);
assertEquals(var,v.getResult(),tolerance);
assertEquals(skew ,s.getResult(),tolerance);
assertEquals(kurt,k.getResult(),tolerance);
}
}