d><code><a href="../../../../../org/apache/commons/math3/exception/NotStrictlyPositiveException.html" title="class in org.apache.commons.math3.exception">NotStrictlyPositiveException</a></code> - if <code>shape &lt;= 0</code> or
 <code>scale &lt;= 0</code>.</dd></dl>
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<h4>GammaDistribution</h4>
<pre>public&nbsp;GammaDistribution(double&nbsp;shape,
                 double&nbsp;scale,
