public Number getValue(int row, int column) {
        return getMedianValue(row, column);
    }

    /**
     * Returns the value for an item.
     *
     * @param rowKey  the row key.
     * @param columnKey  the columnKey.
     *
     * @return The value.
     * 
     * @see #getMedianValue(Comparable, Comparable)
     * @see #getValue(int, int)
     */
    public Number getValue(Comparable rowKey, Comparable columnKey) {
        return getMedianValue(rowKey, columnKey);