quared errors associated with the regression model</dd></dl>
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<h4>getTotalSumSquares</h4>
<pre>public&nbsp;double&nbsp;getTotalSumSquares()</pre>
<div class="block">Returns the sum of squared deviations of the y values about their mean.
 <p>
 This is defined as SSTO
 <a href="http://www.xycoon.com/SumOfSquares.htm">here</a>.</p>
 <p>
 If <code>n < 2</code>, this returns <code>Double.NaN</code>.</p></div>