>
 Bivariate Normal Distribution</a>.</p>
 <p>
 If there are fewer that <strong>three</strong> observations in the
 model, or if there is no variation in x, this returns
 <code>Double.NaN</code>.</p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>significance level for slope/correlation</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../../org/apache/commons/math3/exception/MaxCountExceededException.html" title="class in org.apache.commons.math3.exception">MaxCou