1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package org.apache.commons.math.stat.ranking; 19 20 /** 21 * Strategies for handling tied values in rank transformations. 22 * <ul> 23 * <li>SEQUENTIAL - Ties are assigned ranks in order of occurrence in the original array, 24 * for example (1,3,4,3) is ranked as (1,2,4,3)</li> 25 * <li>MINIMUM - Tied values are assigned the minimum applicable rank, or the rank 26 * of the first occurrence. For example, (1,3,4,3) is ranked as (1,2,4,2)</li> 27 * <li>MAXIMUM - Tied values are assigned the maximum applicable rank, or the rank 28 * of the last occurrence. For example, (1,3,4,3) is ranked as (1,3,4,3)</li> 29 * <li>AVERAGE - Tied values are assigned the average of the applicable ranks. 30 * For example, (1,3,4,3) is ranked as (1,2.5,4,2.5)</li> 31 * <li>RANDOM - Tied values are assigned a random integer rank from among the 32 * applicable values. The assigned rank will always be an integer, (inclusively) 33 * between the values returned by the MINIMUM and MAXIMUM strategies.</li> 34 * </ul> 35 * 36 * @since 2.0 37 * @version $Revision: 981332 $ $Date: 2010-08-02 00:24:31 +0200 (lun. 02 août 2010) $ 38 */ 39 public enum TiesStrategy { 40 41 /** Ties assigned sequential ranks in order of occurrence */ 42 SEQUENTIAL, 43 44 /** Ties get the minimum applicable rank */ 45 MINIMUM, 46 47 /** Ties get the maximum applicable rank */ 48 MAXIMUM, 49 50 /** Ties get the average of applicable ranks */ 51 AVERAGE, 52 53 /** Ties get a random integral value from among applicable ranks */ 54 RANDOM 55 } 56