001    /*
002     * Copyright (C) 2008-2010 by Holger Arndt
003     *
004     * This file is part of the Universal Java Matrix Package (UJMP).
005     * See the NOTICE file distributed with this work for additional
006     * information regarding copyright ownership and licensing.
007     *
008     * UJMP is free software; you can redistribute it and/or modify
009     * it under the terms of the GNU Lesser General Public License as
010     * published by the Free Software Foundation; either version 2
011     * of the License, or (at your option) any later version.
012     *
013     * UJMP is distributed in the hope that it will be useful,
014     * but WITHOUT ANY WARRANTY; without even the implied warranty of
015     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
016     * GNU Lesser General Public License for more details.
017     *
018     * You should have received a copy of the GNU Lesser General Public
019     * License along with UJMP; if not, write to the
020     * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
021     * Boston, MA  02110-1301  USA
022     */
023    
024    package org.ujmp.commonsmath;
025    
026    import org.apache.commons.math.stat.inference.TestUtils;
027    import org.ujmp.core.Matrix;
028    import org.ujmp.core.doublematrix.calculation.AbstractDoubleCalculation;
029    import org.ujmp.core.exceptions.MatrixException;
030    
031    public class PairedTTest extends AbstractDoubleCalculation {
032            private static final long serialVersionUID = 9074733842439986005L;
033    
034            public PairedTTest(Matrix matrix) {
035                    super(matrix);
036            }
037    
038            
039            public double getDouble(long... coordinates) throws MatrixException {
040                    try {
041                            long var1 = coordinates[ROW];
042                            long var2 = coordinates[COLUMN];
043                            double[] sample1 = new double[(int) getSource().getRowCount()];
044                            double[] sample2 = new double[(int) getSource().getRowCount()];
045                            for (int r = 0; r < getSource().getRowCount(); r++) {
046                                    sample1[r] = getSource().getAsDouble(r, var1);
047                                    sample2[r] = getSource().getAsDouble(r, var2);
048                            }
049                            double pValue = TestUtils.pairedTTest(sample1, sample2);
050                            return pValue;
051                    } catch (Exception e) {
052                            throw new MatrixException(e);
053                    }
054            }
055    
056            
057            public long[] getSize() {
058                    return new long[] { getSource().getColumnCount(), getSource().getColumnCount() };
059            }
060    
061    }