ntifier">find_degrees_of_freedom</span><span class="special">(</span>
      <span class="identifier">RealType</span> <span class="identifier">difference_from_mean</span><span class="special">,</span>
      <span class="identifier">RealType</span> <span class="identifier">alpha</span><span class="special">,</span>
      <span class="identifier">RealType</span> <span class="identifier">beta</span><span class="special">,</span>
      <span class="identifier">RealType</span> <span class="identifier">sd</span><s