pan><span class="n">chi</span><span class="o">-</span><span class="n">squared</span>
<span class="w">       </span><span class="n">distribution</span><span class="o">.</span><span class="w"> </span><span class="n">NU</span><span class="w"> </span><span class="n">should</span><span class="w"> </span><span class="n">be</span><span class="w"> </span><span class="n">a</span><span class="w"> </span><span class="n">positive</span><span class="w"> </span><span class="n">integer</span><span class="w"> </span><span 