/**
* Copyright (C) 2001-2017 by RapidMiner and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapidminer.com
*
* This program is free software: you can redistribute it and/or modify it under the terms of the
* GNU Affero General Public License as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License along with this program.
* If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.tools.math.similarity.nominal;
/**
* Implements the Russell-Rao similarity for nominal attributes.
*
* @author Michael Wurst, Sebastian Land
*/
public class RussellRaoNominalSimilarity extends AbstractNominalSimilarity {
private static final long serialVersionUID = -4610984047997023498L;
@Override
protected double calculateSimilarity(double equalNonFalseValues, double unequalValues, double falseValues) {
return equalNonFalseValues / (equalNonFalseValues + unequalValues + falseValues);
}
@Override
public String toString() {
return "Russell-Rao nominal similarity";
}
}