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Pre Issue 29012, getKurtosisClass() did not have a tolerance; therefore, 

any non-zero kurtosis was consistently mesokurtic.  Instead of getting 
into this level of detail, getKurtosisClass() has been removed, it is a
subjective measure not appropriate for DescStat.


git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/math/trunk@141238 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Tim O'Brien 2004-05-23 00:56:15 +00:00
parent 9459e748c8
commit e0452e4d79
7 changed files with 7 additions and 77 deletions
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17
src/java/org/apache/commons/math/stat/univariate/AbstractDescriptiveStatistics.java
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@ -31,7 +31,7 @@ import org.apache.commons.math.stat.univariate.summary.SumOfSquares;
/**
* Abstract superclass for DescriptiveStatistics implementations.
*
* @version $Revision: 1.2 $ $Date: 2004/05/03 14:32:25 $
* @version $Revision: 1.3 $ $Date: 2004/05/23 00:56:15 $
*/
public abstract class AbstractDescriptiveStatistics
extends DescriptiveStatistics {
@ -100,21 +100,6 @@ public abstract class AbstractDescriptiveStatistics
return apply(new Kurtosis());
}
/**
* @see org.apache.commons.math.stat.univariate.DescriptiveStatistics#getKurtosisClass()
*/
public int getKurtosisClass() {
int kClass = MESOKURTIC;
double kurtosis = getKurtosis();
if (kurtosis > 0) {
kClass = LEPTOKURTIC;
} else if (kurtosis < 0) {
kClass = PLATYKURTIC;
}
return (kClass);
}
/**
* @see org.apache.commons.math.stat.univariate.DescriptiveStatistics#getMax()
*/

26
src/java/org/apache/commons/math/stat/univariate/DescriptiveStatistics.java
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@ -23,7 +23,7 @@ import org.apache.commons.discovery.tools.DiscoverClass;
/**
* Abstract factory class for univariate statistical summaries.
*
* @version $Revision: 1.4 $ $Date: 2004/05/19 14:16:31 $
* @version $Revision: 1.5 $ $Date: 2004/05/23 00:56:15 $
*/
public abstract class DescriptiveStatistics implements Serializable, StatisticalSummary {
@ -83,19 +83,6 @@ public abstract class DescriptiveStatistics implements Serializable, Statistical
*/
public static final int INFINITE_WINDOW = -1;
/**
* A LEPTOKURTIC set has a positive kurtosis (a high peak)
*/
public static int LEPTOKURTIC = 1;
/**
* A MESOKURTIC set has a kurtosis of 0 - it is a normal distribution
*/
public static int MESOKURTIC = 0;
/**
* A PLATYKURTIC set has a negative kurtosis (a flat "peak")
*/
public static int PLATYKURTIC = -1;
/**
* Adds the value to the set of numbers
* @param v the value to be added
@ -147,17 +134,6 @@ public abstract class DescriptiveStatistics implements Serializable, Statistical
*/
public abstract double getKurtosis();
/**
* Returns the Kurtosis "classification" a distribution can be
* leptokurtic (high peak), platykurtic (flat peak),
* or mesokurtic (zero kurtosis).
*
* @return A static constant defined in this interface,
* StoredDeviation.LEPTOKURITC, StoredDeviation.PLATYKURTIC, or
* StoredDeviation.MESOKURTIC
*/
public abstract int getKurtosisClass();
/**
* Returns the maximum of the available values
* @return The max or Double.NaN if no values have been added.

4
src/test/org/apache/commons/math/stat/StatUtilsTest.java
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@ -20,11 +20,10 @@ import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.apache.commons.math.TestUtils;
import org.apache.commons.math.stat.univariate.DescriptiveStatistics;
/**
* Test cases for the {@link StatUtils} class.
* @version $Revision: 1.15 $ $Date: 2004/04/27 16:42:31 $
* @version $Revision: 1.16 $ $Date: 2004/05/23 00:56:15 $
*/
public final class StatUtilsTest extends TestCase {
@ -42,7 +41,6 @@ public final class StatUtilsTest extends TestCase {
private double max = 3;
private double skewness = 0;
private double kurtosis = 0.5;
private int kClass = DescriptiveStatistics.LEPTOKURTIC;
private double tolerance = 10E-15;
public StatUtilsTest(String name) {

28
src/test/org/apache/commons/math/stat/univariate/DescriptiveStatisticsTest.java
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@ -26,7 +26,7 @@ import org.apache.commons.math.random.RandomDataImpl;
/**
* Test cases for the {@link Univariate} class.
*
* @version $Revision: 1.5 $ $Date: 2004/05/23 00:30:01 $
* @version $Revision: 1.6 $ $Date: 2004/05/23 00:56:15 $
*/
public final class DescriptiveStatisticsTest extends TestCase {
@ -43,7 +43,6 @@ public final class DescriptiveStatisticsTest extends TestCase {
private double max = 3;
private double skewness = 0;
private double kurtosis = 0.5;
private int kClass = DescriptiveStatistics.LEPTOKURTIC;
private double tolerance = 10E-15;
public DescriptiveStatisticsTest(String name) {
@ -408,30 +407,5 @@ public final class DescriptiveStatisticsTest extends TestCase {
assertEquals(3.0, u.getMean(), tolerance);
}
public void testKurtosisClass() {
DescriptiveStatistics u = DescriptiveStatistics.newInstance();
u.setWindowSize(5);
u.addValue(1.0);
u.addValue(1.0);
u.addValue(2.0);
u.addValue(1.0);
u.addValue(1.0);
assertEquals(DescriptiveStatistics.LEPTOKURTIC, u.getKurtosisClass());
u.addValue(1.0);
u.addValue(2.0);
u.addValue(2.0);
u.addValue(2.0);
u.addValue(1.0);
assertEquals(DescriptiveStatistics.PLATYKURTIC, u.getKurtosisClass());
//
// u.addValue(1.0);
// u.addValue(1.5);
// u.addValue(2.0912994180548905);
// u.addValue(1.5);
// u.addValue(1.0);
// assertEquals(DescriptiveStatistics.MESOKURTIC, u.getKurtosisClass());
}
}

3
src/test/org/apache/commons/math/stat/univariate/ListUnivariateImplTest.java
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@ -25,7 +25,7 @@ import junit.framework.TestSuite;
/**
* Test cases for the {@link Univariate} class.
*
* @version $Revision: 1.1 $ $Date: 2004/04/12 02:27:50 $
* @version $Revision: 1.2 $ $Date: 2004/05/23 00:56:15 $
*/
public final class ListUnivariateImplTest extends TestCase {
@ -43,7 +43,6 @@ public final class ListUnivariateImplTest extends TestCase {
private double max = 3;
private double skewness = 0;
private double kurtosis = 0.5;
private int kClass = DescriptiveStatistics.LEPTOKURTIC;
private double tolerance = 10E-15;
public ListUnivariateImplTest(String name) {

3
src/test/org/apache/commons/math/stat/univariate/MixedListUnivariateImplTest.java
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@ -27,7 +27,7 @@ import junit.framework.TestSuite;
/**
* Test cases for the {@link Univariate} class.
*
* @version $Revision: 1.1 $ $Date: 2004/04/12 02:27:50 $
* @version $Revision: 1.2 $ $Date: 2004/05/23 00:56:15 $
*/
public final class MixedListUnivariateImplTest extends TestCase {
@ -45,7 +45,6 @@ public final class MixedListUnivariateImplTest extends TestCase {
private double max = 3;
private double skewness = 0;
private double kurtosis = 0.5;
private int kClass = DescriptiveStatistics.LEPTOKURTIC;
private double tolerance = 10E-15;
private TransformerMap transformers = new TransformerMap();

3
src/test/org/apache/commons/math/stat/univariate/StoreUnivariateImplTest.java
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@ -25,7 +25,7 @@ import org.apache.commons.math.random.RandomDataImpl;
/**
* Test cases for the {@link Univariate} class.
*
* @version $Revision: 1.1 $ $Date: 2004/04/12 02:27:50 $
* @version $Revision: 1.2 $ $Date: 2004/05/23 00:56:15 $
*/
public final class StoreUnivariateImplTest extends TestCase {
@ -42,7 +42,6 @@ public final class StoreUnivariateImplTest extends TestCase {
private double max = 3;
private double skewness = 0;
private double kurtosis = 0.5;
private int kClass = DescriptiveStatistics.LEPTOKURTIC;
private double tolerance = 10E-15;
public StoreUnivariateImplTest(String name) {