/*
* VarianceStatistic.java
*
* Copyright (c) 2002-2015 Alexei Drummond, Andrew Rambaut and Marc Suchard
*
* This file is part of BEAST.
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership and licensing.
*
* BEAST is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* BEAST 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with BEAST; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
package dr.inference.model;
import dr.stats.DiscreteStatistics;
import java.util.Vector;
/**
* @version $Id: VarianceStatistic.java,v 1.3 2005/05/24 20:26:00 rambaut Exp $
*
* @author Alexei Drummond
*/
public class VarianceStatistic extends Statistic.Abstract {
public VarianceStatistic(String name) {
super(name);
}
public void addStatistic(Statistic statistic) {
statistics.add(statistic);
int dimensionCount = 0;
for (int i = 0; i < statistics.size(); i++) {
statistic = (Statistic)statistics.get(i);
dimensionCount += statistic.getDimension();
}
values = new double[dimensionCount];
}
public int getDimension() { return 1; }
/** @return variance of contained statistics */
public final double getStatisticValue(int dim) {
int n;
Statistic statistic;
int index = 0;
for (int i = 0; i < statistics.size(); i++) {
statistic = (Statistic)statistics.get(i);
n = statistic.getDimension();
for (int j = 0; j < n; j++) {
values[index] = statistic.getStatisticValue(j);
index += 1;
}
}
return DiscreteStatistics.variance(values);
}
// ****************************************************************
// Private and protected stuff
// ****************************************************************
private Vector statistics = new Vector();
private double[] values = null;
}