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 }