/code>.
 <p>
 <code>(data[0][0],data[0][1])</code> will be the first observation, then
 <code>(data[1][0],data[1][1])</code>, etc.</p>
 <p>
 This method does not replace data that has already been added.  The
 observations represented by <code>data</code> are added to the existing
 dataset.</p>
 <p>
 To replace all data, use <code>clear()</code> before adding the new
 data.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>data</code> - array of observations to be added</dd>
<dt><span 