1 files changed, 57 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/math3/stat/descriptive/WeightedEvaluation.java b/src/main/java/org/apache/commons/math3/stat/descriptive/WeightedEvaluation.java
new file mode 100644
index 0000000..01693dc
--- /dev/null
+++ b/src/main/java/org/apache/commons/math3/stat/descriptive/WeightedEvaluation.java
@@ -0,0 +1,57 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.math3.stat.descriptive;
+
+import org.apache.commons.math3.exception.MathIllegalArgumentException;
+
+/**
+ * Weighted evaluation for statistics.
+ *
+ * @since 2.1
+ */
+public interface WeightedEvaluation {
+
+    /**
+     * Returns the result of evaluating the statistic over the input array,
+     * using the supplied weights.
+     *
+     * @param values input array
+     * @param weights array of weights
+     * @return the value of the weighted statistic applied to the input array
+     * @throws MathIllegalArgumentException if either array is null, lengths
+     * do not match, weights contain NaN, negative or infinite values, or
+     * weights does not include at least on positive value
+     */
+    double evaluate(double[] values, double[] weights) throws MathIllegalArgumentException;
+
+    /**
+     * Returns the result of evaluating the statistic over the specified entries
+     * in the input array, using corresponding entries in the supplied weights array.
+     *
+     * @param values the input array
+     * @param weights array of weights
+     * @param begin the index of the first element to include
+     * @param length the number of elements to include
+     * @return the value of the weighted statistic applied to the included array entries
+     * @throws MathIllegalArgumentException if either array is null, lengths
+     * do not match, indices are invalid, weights contain NaN, negative or
+     * infinite values, or weights does not include at least on positive value
+     */
+    double evaluate(double[] values, double[] weights, int begin, int length)
+    throws MathIllegalArgumentException;
+
+}