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<h4>getRSquare</h4>
<pre>public&nbsp;double&nbsp;getRSquare()</pre>
<div class="block">Returns the <a href="http://www.xycoon.com/coefficient1.htm">
 coefficient of determination</a>,
 usually denoted r-square.
 <p>
 <strong>Preconditions</strong>: <ul>
 <li>At least two observations (with at least two different x values)
 must have been added before invoking this method. If this method is
 invoked before a model can be estimated, <code>Double,Na