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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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package org.apache.commons.math.stat.ranking;
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* Interface representing a rank transformation.
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* @version $Revision: 799857 $ $Date: 2009-08-01 09:07:12 -0400 (Sat, 01 Aug 2009) $
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public interface RankingAlgorithm {
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* <p>Performs a rank transformation on the input data, returning an array
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* <p>Ranks should be 1-based - that is, the smallest value
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* returned in an array of ranks should be greater than or equal to one,
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* rather than 0. Ranks should in general take integer values, though
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* implementations may return averages or other floating point values
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* to resolve ties in the input data.</p>
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* @param data array of data to be ranked
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* @return an array of ranks corresponding to the elements of the input array
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double[] rank (double[] data);