diff --git a/src/test/org/apache/commons/math/stat/univariate/StorelessUnivariateStatisticAbstractTest.java b/src/test/org/apache/commons/math/stat/univariate/StorelessUnivariateStatisticAbstractTest.java
new file mode 100644
index 000000000..8726ab01d
--- /dev/null
+++ b/src/test/org/apache/commons/math/stat/univariate/StorelessUnivariateStatisticAbstractTest.java
@@ -0,0 +1,93 @@
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2003 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ *    any, must include the following acknowlegement:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowlegement may appear in the software itself,
+ *    if and wherever such third-party acknowlegements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Commons", and "Apache Software
+ *    Foundation" must not be used to endorse or promote products derived
+ *    from this software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their names without prior written
+ *    permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+package org.apache.commons.math.stat.univariate;
+
+import junit.framework.TestCase;
+
+/**
+ * Test cases for the {@link UnivariateStatistic} class.
+ *
+ * @author Mark Diggory
+ */
+public abstract class StorelessUnivariateStatisticAbstractTest
+    extends UnivariateStatisticAbstractTest {
+
+    public StorelessUnivariateStatisticAbstractTest(String name) {
+        super(name);
+    }
+
+    public abstract UnivariateStatistic getUnivariateStatistic();
+
+    public abstract double expectedValue();
+
+    public void testIncrementation() throws Exception {
+
+        StorelessUnivariateStatistic statistic =
+            (StorelessUnivariateStatistic) getUnivariateStatistic();
+
+        statistic.clear();
+
+        for (int i = 0; i < testArray.length; i++) {
+            statistic.increment(testArray[i]);
+        }
+
+        assertEquals(expectedValue(), statistic.getValue(), getTolerance());
+        
+        statistic.clear();
+        
+        assertTrue(Double.isNaN(statistic.getValue()));
+        
+    }
+
+}
diff --git a/src/test/org/apache/commons/math/stat/univariate/UnivariateStatisticAbstractTest.java b/src/test/org/apache/commons/math/stat/univariate/UnivariateStatisticAbstractTest.java
index 02837a0cc..cd7610bcb 100644
--- a/src/test/org/apache/commons/math/stat/univariate/UnivariateStatisticAbstractTest.java
+++ b/src/test/org/apache/commons/math/stat/univariate/UnivariateStatisticAbstractTest.java
@@ -124,5 +124,5 @@ public abstract class UnivariateStatisticAbstractTest extends TestCase {
             getUnivariateStatistic().evaluate(testArray),
             getTolerance());
     }
-
+    
 }
diff --git a/src/test/org/apache/commons/math/stat/univariate/moment/KurtosisTest.java b/src/test/org/apache/commons/math/stat/univariate/moment/KurtosisTest.java
index 8310cdbd4..912a22823 100644
--- a/src/test/org/apache/commons/math/stat/univariate/moment/KurtosisTest.java
+++ b/src/test/org/apache/commons/math/stat/univariate/moment/KurtosisTest.java
@@ -56,6 +56,7 @@ package org.apache.commons.math.stat.univariate.moment;
 import junit.framework.Test;
 import junit.framework.TestSuite;
 
+import org.apache.commons.math.stat.univariate.StorelessUnivariateStatisticAbstractTest;
 import org.apache.commons.math.stat.univariate.UnivariateStatistic;
 import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
 
@@ -64,7 +65,7 @@ import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
  *
  * @author Mark Diggory
  */
-public class KurtosisTest extends UnivariateStatisticAbstractTest{
+public class KurtosisTest extends StorelessUnivariateStatisticAbstractTest{
 
     protected Kurtosis stat;
     
diff --git a/src/test/org/apache/commons/math/stat/univariate/moment/MeanTest.java b/src/test/org/apache/commons/math/stat/univariate/moment/MeanTest.java
index 4b1e8e6a3..7690acb77 100644
--- a/src/test/org/apache/commons/math/stat/univariate/moment/MeanTest.java
+++ b/src/test/org/apache/commons/math/stat/univariate/moment/MeanTest.java
@@ -56,6 +56,7 @@ package org.apache.commons.math.stat.univariate.moment;
 import junit.framework.Test;
 import junit.framework.TestSuite;
 
+import org.apache.commons.math.stat.univariate.StorelessUnivariateStatisticAbstractTest;
 import org.apache.commons.math.stat.univariate.UnivariateStatistic;
 import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
 
@@ -64,7 +65,7 @@ import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
  *
  * @author Mark Diggory
  */
-public class MeanTest extends UnivariateStatisticAbstractTest{
+public class MeanTest extends StorelessUnivariateStatisticAbstractTest{
 
     protected Mean stat;
     
diff --git a/src/test/org/apache/commons/math/stat/univariate/moment/SkewnessTest.java b/src/test/org/apache/commons/math/stat/univariate/moment/SkewnessTest.java
index b06d91de8..7ad1606b6 100644
--- a/src/test/org/apache/commons/math/stat/univariate/moment/SkewnessTest.java
+++ b/src/test/org/apache/commons/math/stat/univariate/moment/SkewnessTest.java
@@ -56,6 +56,7 @@ package org.apache.commons.math.stat.univariate.moment;
 import junit.framework.Test;
 import junit.framework.TestSuite;
 
+import org.apache.commons.math.stat.univariate.StorelessUnivariateStatisticAbstractTest;
 import org.apache.commons.math.stat.univariate.UnivariateStatistic;
 import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
 
@@ -64,7 +65,7 @@ import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
  *
  * @author Mark Diggory
  */
-public class SkewnessTest extends UnivariateStatisticAbstractTest{
+public class SkewnessTest extends StorelessUnivariateStatisticAbstractTest{
 
     protected Skewness stat;
     
diff --git a/src/test/org/apache/commons/math/stat/univariate/moment/StandardDeviationTest.java b/src/test/org/apache/commons/math/stat/univariate/moment/StandardDeviationTest.java
index 887fc3a84..2623dc39c 100644
--- a/src/test/org/apache/commons/math/stat/univariate/moment/StandardDeviationTest.java
+++ b/src/test/org/apache/commons/math/stat/univariate/moment/StandardDeviationTest.java
@@ -56,6 +56,7 @@ package org.apache.commons.math.stat.univariate.moment;
 import junit.framework.Test;
 import junit.framework.TestSuite;
 
+import org.apache.commons.math.stat.univariate.StorelessUnivariateStatisticAbstractTest;
 import org.apache.commons.math.stat.univariate.UnivariateStatistic;
 import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
 
@@ -64,7 +65,7 @@ import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
  *
  * @author Mark Diggory
  */
-public class StandardDeviationTest extends UnivariateStatisticAbstractTest{
+public class StandardDeviationTest extends StorelessUnivariateStatisticAbstractTest{
 
     protected StandardDeviation stat;
     
diff --git a/src/test/org/apache/commons/math/stat/univariate/moment/VarianceTest.java b/src/test/org/apache/commons/math/stat/univariate/moment/VarianceTest.java
index 5bfabeb28..f99a7ef46 100644
--- a/src/test/org/apache/commons/math/stat/univariate/moment/VarianceTest.java
+++ b/src/test/org/apache/commons/math/stat/univariate/moment/VarianceTest.java
@@ -56,6 +56,7 @@ package org.apache.commons.math.stat.univariate.moment;
 import junit.framework.Test;
 import junit.framework.TestSuite;
 
+import org.apache.commons.math.stat.univariate.StorelessUnivariateStatisticAbstractTest;
 import org.apache.commons.math.stat.univariate.UnivariateStatistic;
 import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
 
@@ -64,7 +65,7 @@ import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
  *
  * @author Mark Diggory
  */
-public class VarianceTest extends UnivariateStatisticAbstractTest{
+public class VarianceTest extends StorelessUnivariateStatisticAbstractTest{
 
     protected Variance stat;
     
diff --git a/src/test/org/apache/commons/math/stat/univariate/rank/MaxTest.java b/src/test/org/apache/commons/math/stat/univariate/rank/MaxTest.java
index 1f4445ce1..b7c0f9565 100644
--- a/src/test/org/apache/commons/math/stat/univariate/rank/MaxTest.java
+++ b/src/test/org/apache/commons/math/stat/univariate/rank/MaxTest.java
@@ -56,6 +56,7 @@ package org.apache.commons.math.stat.univariate.rank;
 import junit.framework.Test;
 import junit.framework.TestSuite;
 
+import org.apache.commons.math.stat.univariate.StorelessUnivariateStatisticAbstractTest;
 import org.apache.commons.math.stat.univariate.UnivariateStatistic;
 import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
 
@@ -64,7 +65,7 @@ import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
  *
  * @author Mark Diggory
  */
-public class MaxTest extends UnivariateStatisticAbstractTest{
+public class MaxTest extends StorelessUnivariateStatisticAbstractTest{
 
     protected Max stat;
     
diff --git a/src/test/org/apache/commons/math/stat/univariate/rank/MinTest.java b/src/test/org/apache/commons/math/stat/univariate/rank/MinTest.java
index 1d72da157..21ca88dac 100644
--- a/src/test/org/apache/commons/math/stat/univariate/rank/MinTest.java
+++ b/src/test/org/apache/commons/math/stat/univariate/rank/MinTest.java
@@ -56,6 +56,7 @@ package org.apache.commons.math.stat.univariate.rank;
 import junit.framework.Test;
 import junit.framework.TestSuite;
 
+import org.apache.commons.math.stat.univariate.StorelessUnivariateStatisticAbstractTest;
 import org.apache.commons.math.stat.univariate.UnivariateStatistic;
 import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
 
@@ -64,7 +65,7 @@ import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
  *
  * @author Mark Diggory
  */
-public class MinTest extends UnivariateStatisticAbstractTest{
+public class MinTest extends StorelessUnivariateStatisticAbstractTest{
 
     protected Min stat;
     
diff --git a/src/test/org/apache/commons/math/stat/univariate/summary/ProductTest.java b/src/test/org/apache/commons/math/stat/univariate/summary/ProductTest.java
index 4aea3aba1..9a50eb5d6 100644
--- a/src/test/org/apache/commons/math/stat/univariate/summary/ProductTest.java
+++ b/src/test/org/apache/commons/math/stat/univariate/summary/ProductTest.java
@@ -56,6 +56,7 @@ package org.apache.commons.math.stat.univariate.summary;
 import junit.framework.Test;
 import junit.framework.TestSuite;
 
+import org.apache.commons.math.stat.univariate.StorelessUnivariateStatisticAbstractTest;
 import org.apache.commons.math.stat.univariate.UnivariateStatistic;
 import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
 
@@ -64,7 +65,7 @@ import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
  *
  * @author Mark Diggory
  */
-public class ProductTest extends UnivariateStatisticAbstractTest{
+public class ProductTest extends StorelessUnivariateStatisticAbstractTest{
 
     protected Product stat;
     
diff --git a/src/test/org/apache/commons/math/stat/univariate/summary/SumLogTest.java b/src/test/org/apache/commons/math/stat/univariate/summary/SumLogTest.java
index fac46b1cf..5e364309a 100644
--- a/src/test/org/apache/commons/math/stat/univariate/summary/SumLogTest.java
+++ b/src/test/org/apache/commons/math/stat/univariate/summary/SumLogTest.java
@@ -56,6 +56,7 @@ package org.apache.commons.math.stat.univariate.summary;
 import junit.framework.Test;
 import junit.framework.TestSuite;
 
+import org.apache.commons.math.stat.univariate.StorelessUnivariateStatisticAbstractTest;
 import org.apache.commons.math.stat.univariate.UnivariateStatistic;
 import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
 
@@ -64,7 +65,7 @@ import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
  *
  * @author Mark Diggory
  */
-public class SumLogTest extends UnivariateStatisticAbstractTest{
+public class SumLogTest extends StorelessUnivariateStatisticAbstractTest{
 
     protected SumOfLogs stat;
     
diff --git a/src/test/org/apache/commons/math/stat/univariate/summary/SumSqTest.java b/src/test/org/apache/commons/math/stat/univariate/summary/SumSqTest.java
index 1815a365f..351cef231 100644
--- a/src/test/org/apache/commons/math/stat/univariate/summary/SumSqTest.java
+++ b/src/test/org/apache/commons/math/stat/univariate/summary/SumSqTest.java
@@ -56,6 +56,7 @@ package org.apache.commons.math.stat.univariate.summary;
 import junit.framework.Test;
 import junit.framework.TestSuite;
 
+import org.apache.commons.math.stat.univariate.StorelessUnivariateStatisticAbstractTest;
 import org.apache.commons.math.stat.univariate.UnivariateStatistic;
 import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
 
@@ -64,7 +65,7 @@ import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
  *
  * @author Mark Diggory
  */
-public class SumSqTest extends UnivariateStatisticAbstractTest{
+public class SumSqTest extends StorelessUnivariateStatisticAbstractTest{
 
     protected SumOfSquares stat;
     
diff --git a/src/test/org/apache/commons/math/stat/univariate/summary/SumTest.java b/src/test/org/apache/commons/math/stat/univariate/summary/SumTest.java
index b717cd133..403cdd256 100644
--- a/src/test/org/apache/commons/math/stat/univariate/summary/SumTest.java
+++ b/src/test/org/apache/commons/math/stat/univariate/summary/SumTest.java
@@ -56,6 +56,7 @@ package org.apache.commons.math.stat.univariate.summary;
 import junit.framework.Test;
 import junit.framework.TestSuite;
 
+import org.apache.commons.math.stat.univariate.StorelessUnivariateStatisticAbstractTest;
 import org.apache.commons.math.stat.univariate.UnivariateStatistic;
 import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
 
@@ -64,7 +65,7 @@ import org.apache.commons.math.stat.univariate.UnivariateStatisticAbstractTest;
  *
  * @author Mark Diggory
  */
-public class SumTest extends UnivariateStatisticAbstractTest{
+public class SumTest extends StorelessUnivariateStatisticAbstractTest{
 
     protected Sum stat;