span class="identifier">math</span><span class="special">/</span><span class="identifier">differentiation</span><span class="special">/</span><span class="identifier">finite_difference</span><span class="special">.</span><span class="identifier">hpp</span></code>.
        </li>
<li class="listitem">
          Add mean, variance, skewness, kurtosis, median, Gini coefficient, and median
          absolute deviation to <code class="computeroutput"><span class="identifier">tools</span><span class="special">/</s