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jfreechart example source code file (BoxAndWhiskerCalculator.java)

This example jfreechart source code file (BoxAndWhiskerCalculator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

arraylist, boxandwhiskercalculator, boxandwhiskeritem, boxandwhiskeritem, double, double, illegalargumentexception, iterator, list, list, null, number, number, object, util

The jfreechart BoxAndWhiskerCalculator.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library 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 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * ----------------------------
 * BoxAndWhiskerCalculator.java
 * ----------------------------
 * (C) Copyright 2003-2008,  by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 28-Aug-2003 : Version 1 (DG);
 * 17-Nov-2003 : Fixed bug in calculations of outliers and median (DG);
 * 10-Jan-2005 : Removed deprecated methods in preparation for 1.0.0
 *               release (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 15-Nov-2006 : Cleaned up handling of null arguments, and null or NaN items
 *               in the list (DG);
 *
 */

package org.jfree.data.statistics;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

/**
 * A utility class that calculates the mean, median, quartiles Q1 and Q3, plus
 * a list of outlier values...all from an arbitrary list of
 * <code>Number objects.
 */
public abstract class BoxAndWhiskerCalculator {

    /**
     * Calculates the statistics required for a {@link BoxAndWhiskerItem}
     * from a list of <code>Number objects.  Any items in the list
     * that are <code>null, not an instance of Number, or
     * equivalent to <code>Double.NaN, will be ignored.
     *
     * @param values  a list of numbers (a <code>null list is not
     *                permitted).
     *
     * @return A box-and-whisker item.
     */
    public static BoxAndWhiskerItem calculateBoxAndWhiskerStatistics(
                                        List values) {
        return calculateBoxAndWhiskerStatistics(values, true);
    }

    /**
     * Calculates the statistics required for a {@link BoxAndWhiskerItem}
     * from a list of <code>Number objects.  Any items in the list
     * that are <code>null, not an instance of Number, or
     * equivalent to <code>Double.NaN, will be ignored.
     *
     * @param values  a list of numbers (a <code>null list is not
     *                permitted).
     * @param stripNullAndNaNItems  a flag that controls the handling of null
     *     and NaN items.
     *
     * @return A box-and-whisker item.
     *
     * @since 1.0.3
     */
    public static BoxAndWhiskerItem calculateBoxAndWhiskerStatistics(
            List values, boolean stripNullAndNaNItems) {

        if (values == null) {
            throw new IllegalArgumentException("Null 'values' argument.");
        }

        List vlist;
        if (stripNullAndNaNItems) {
            vlist = new ArrayList(values.size());
            Iterator iterator = values.listIterator();
            while (iterator.hasNext()) {
                Object obj = iterator.next();
                if (obj instanceof Number) {
                    Number n = (Number) obj;
                    double v = n.doubleValue();
                    if (!Double.isNaN(v)) {
                        vlist.add(n);
                    }
                }
            }
        }
        else {
            vlist = values;
        }
        Collections.sort(vlist);

        double mean = Statistics.calculateMean(vlist, false);
        double median = Statistics.calculateMedian(vlist, false);
        double q1 = calculateQ1(vlist);
        double q3 = calculateQ3(vlist);

        double interQuartileRange = q3 - q1;

        double upperOutlierThreshold = q3 + (interQuartileRange * 1.5);
        double lowerOutlierThreshold = q1 - (interQuartileRange * 1.5);

        double upperFaroutThreshold = q3 + (interQuartileRange * 2.0);
        double lowerFaroutThreshold = q1 - (interQuartileRange * 2.0);

        double minRegularValue = Double.POSITIVE_INFINITY;
        double maxRegularValue = Double.NEGATIVE_INFINITY;
        double minOutlier = Double.POSITIVE_INFINITY;
        double maxOutlier = Double.NEGATIVE_INFINITY;
        List outliers = new ArrayList();

        Iterator iterator = vlist.iterator();
        while (iterator.hasNext()) {
            Number number = (Number) iterator.next();
            double value = number.doubleValue();
            if (value > upperOutlierThreshold) {
                outliers.add(number);
                if (value > maxOutlier && value <= upperFaroutThreshold) {
                    maxOutlier = value;
                }
            }
            else if (value < lowerOutlierThreshold) {
                outliers.add(number);
                if (value < minOutlier && value >= lowerFaroutThreshold) {
                    minOutlier = value;
                }
            }
            else {
                minRegularValue = Math.min(minRegularValue, value);
                maxRegularValue = Math.max(maxRegularValue, value);
            }
            minOutlier = Math.min(minOutlier, minRegularValue);
            maxOutlier = Math.max(maxOutlier, maxRegularValue);
        }

        return new BoxAndWhiskerItem(new Double(mean), new Double(median),
                new Double(q1), new Double(q3), new Double(minRegularValue),
                new Double(maxRegularValue), new Double(minOutlier),
                new Double(maxOutlier), outliers);

    }

    /**
     * Calculates the first quartile for a list of numbers in ascending order.
     * If the items in the list are not in ascending order, the result is
     * unspecified.  If the list contains items that are <code>null, not
     * an instance of <code>Number, or equivalent to
     * <code>Double.NaN, the result is unspecified.
     *
     * @param values  the numbers in ascending order (<code>null not
     *     permitted).
     *
     * @return The first quartile.
     */
    public static double calculateQ1(List values) {
        if (values == null) {
            throw new IllegalArgumentException("Null 'values' argument.");
        }

        double result = Double.NaN;
        int count = values.size();
        if (count > 0) {
            if (count % 2 == 1) {
                if (count > 1) {
                    result = Statistics.calculateMedian(values, 0, count / 2);
                }
                else {
                    result = Statistics.calculateMedian(values, 0, 0);
                }
            }
            else {
                result = Statistics.calculateMedian(values, 0, count / 2 - 1);
            }

        }
        return result;
    }

    /**
     * Calculates the third quartile for a list of numbers in ascending order.
     * If the items in the list are not in ascending order, the result is
     * unspecified.  If the list contains items that are <code>null, not
     * an instance of <code>Number, or equivalent to
     * <code>Double.NaN, the result is unspecified.
     *
     * @param values  the list of values (<code>null not permitted).
     *
     * @return The third quartile.
     */
    public static double calculateQ3(List values) {
        if (values == null) {
            throw new IllegalArgumentException("Null 'values' argument.");
        }
        double result = Double.NaN;
        int count = values.size();
        if (count > 0) {
            if (count % 2 == 1) {
                if (count > 1) {
                    result = Statistics.calculateMedian(values, count / 2,
                            count - 1);
                }
                else {
                    result = Statistics.calculateMedian(values, 0, 0);
                }
            }
            else {
                result = Statistics.calculateMedian(values, count / 2,
                        count - 1);
            }
        }
        return result;
    }

}

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