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The Apache Commons Math project is a library of lightweight, self-contained mathematics and statistics components addressing the most common practical problems not immediately available in the Java programming language or commons-lang.
/*
* 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.ranking;
/**
* Interface representing a rank transformation.
*
* @since 2.0
*/
public interface RankingAlgorithm {
/**
* Performs a rank transformation on the input data, returning an array
* of ranks.
*
* Ranks should be 1-based - that is, the smallest value
* returned in an array of ranks should be greater than or equal to one,
* rather than 0. Ranks should in general take integer values, though
* implementations may return averages or other floating point values
* to resolve ties in the input data.
*
* @param data array of data to be ranked
* @return an array of ranks corresponding to the elements of the input array
*/
double[] rank (double[] data);
}