/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2004, 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., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * -------------------------------
 * StatisticalCategoryDataset.java
 * -------------------------------
 * (C) Copyright 2002, 2003, by Pascal Collet and Contributors.
 *
 * Original Author:  Pascal Collet;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: StatisticalCategoryDataset.java,v 1.2 2004/01/05 17:11:52 mungady Exp $
 *
 * Changes
 * -------
 * 21-Aug-2002 : Version 1, contributed by Pascal Collet (DG);
 * 07-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 24-Oct-2002 : Amendments in line with changes to the CategoryDataset interface (DG);
 *
 */

package org.jfree.data.statistics;

import org.jfree.data.CategoryDataset;

/**
 * A category dataset that defines a median and standard deviation value for each item.
 *
 * @author Pascal Collet
 *
 */
public interface StatisticalCategoryDataset extends CategoryDataset {

    /**
     * Returns the mean value for an item.
     *
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     *
     * @return the mean value.
     */
    public Number getMeanValue(int row, int column);

    /**
     * Returns the mean value for an item.
     *
     * @param rowKey  the row key.
     * @param columnKey  the columnKey.
     *
     * @return the mean value.
     */
    public Number getMeanValue(Comparable rowKey, Comparable columnKey);

    /**
     * Returns the standard deviation value for an item.
     *
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     *
     * @return the standard deviation.
     */
    public Number getStdDevValue(int row, int column);

    /**
     * Returns the standard deviation value for an item.
     *
     * @param rowKey  the row key.
     * @param columnKey  the columnKey.
     *
     * @return the standard deviation.
     */
    public Number getStdDevValue(Comparable rowKey, Comparable columnKey);

}

