Added test utility inadvertently omitted from r910264. JIRA: MATH-323.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@910784 13f79535-47bb-0310-9956-ffa450edef68

src/test/java/org/apache/commons/math/TestUtils.java

@@ -346,4 +346,20 @@ public class TestUtils {
         }
     }
     
+    /**
+     * Computes the sum of squared deviations of <values> from <target>
+     * @param values array of deviates
+     * @param target value to compute deviations from
+     * 
+     * @return sum of squared deviations
+     */
+    public static double sumSquareDev(double[] values, double target) {
+        double sumsq = 0d;
+        for (int i = 0; i < values.length; i++) {
+            final double dev = values[i] - target;
+            sumsq += (dev * dev);
+        }
+        return sumsq;
+    }
+
 }