   directory.</dd>
<dt><span class="strong">Returns:</span></dt><dd>the Properties</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.Exception</code> - if no default properties are defined, or if an error
              occurs reading the properties files.</dd></dl>
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<h4>correlation</h4>
<pre>public static final&nbsp;double&nbsp;correlation(double[]&nbsp;y1,
           