dard deviation:</span>
<span class="keyword">double</span> <span class="identifier">sd95</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">abs</span><span class="special">((</span><span class="identifier">x</span> <span class="special">-</span> <span class="identifier">mean</span><span class="special">))</span> <span class="special">/</span> <span class="identifier">qp</span><span class="special">;</span>

<span class="identifier