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Diffstat (limited to 'elki/src/test/java/de/lmu/ifi/dbs/elki/math/statistics/dependence/DistanceCorrelationDependenceMeasureTest.java')
-rw-r--r-- | elki/src/test/java/de/lmu/ifi/dbs/elki/math/statistics/dependence/DistanceCorrelationDependenceMeasureTest.java | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/elki/src/test/java/de/lmu/ifi/dbs/elki/math/statistics/dependence/DistanceCorrelationDependenceMeasureTest.java b/elki/src/test/java/de/lmu/ifi/dbs/elki/math/statistics/dependence/DistanceCorrelationDependenceMeasureTest.java new file mode 100644 index 00000000..bcf493be --- /dev/null +++ b/elki/src/test/java/de/lmu/ifi/dbs/elki/math/statistics/dependence/DistanceCorrelationDependenceMeasureTest.java @@ -0,0 +1,77 @@ +package de.lmu.ifi.dbs.elki.math.statistics.dependence; + +/* + This file is part of ELKI: + Environment for Developing KDD-Applications Supported by Index-Structures + + Copyright (C) 2015 + Ludwig-Maximilians-Universität München + Lehr- und Forschungseinheit für Datenbanksysteme + ELKI Development Team + + 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/>. + */ + +import static org.junit.Assert.assertEquals; + +import java.util.Arrays; + +import org.junit.Test; + +import de.lmu.ifi.dbs.elki.JUnit4Test; +import de.lmu.ifi.dbs.elki.utilities.datastructures.arraylike.ArrayLikeUtil; + +/** + * Validate dCor by comparing to output of the official R version. + * + * @author Erich Schubert + * @since 0.4.0 + */ +public class DistanceCorrelationDependenceMeasureTest implements JUnit4Test { + double[][] data = { // + { 1, 2, 3, 4 }, // + { 1, 3, 5, 7 }, // + { 4, 3, 2, 1 }, // + { 1, 4, 2, 3 }, // + { 1, 0, 0, 1 }, // + { 0, 0, 0, 0 } }; + + double[][] R = { // + { 1. }, // + { 1., 1. }, // + { 1., 1., 1. }, // + { 0.7337994, 0.7337994, 0.7337994, 1. }, // + { 0.5266404, 0.5266404, 0.5266404, 0.5266404, 1 }, // + { 0., 0., 0., 0., 0., 0. }, // + }; + + @Test + public void testDistanceCorrelation() { + DistanceCorrelationDependenceMeasure dCor = DistanceCorrelationDependenceMeasure.STATIC; + for(int i = 0; i < data.length; i++) { + for(int j = 0; j <= i; j++) { + double dcor = dCor.dependence(data[i], data[j]); + assertEquals("dCor does not match for " + i + "," + j, R[i][j], dcor, 1e-7); + } + } + // Bulk computation + double[] mat = dCor.dependence(ArrayLikeUtil.DOUBLEARRAYADAPTER, Arrays.asList(data)); + for(int i = 0, c = 0; i < data.length; i++) { + for(int j = 0; j < i; j++) { + double co = mat[c++]; + assertEquals("dCor does not match for " + i + "," + j, R[i][j], co, 1e-7); + } + } + } +} |