/* ===========================================================

 * 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 1.1 2004/08/31 15:32:24 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.category.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);



}



