pan><span class="identifier">univariate_statistics</span><span class="special">.</span><span class="identifier">hpp</span></code>.
        </li>
<li class="listitem">
          Add correlation coefficients and covariance to <code class="computeroutput"><span class="identifier">tools</span><span class="special">/</span><span class="identifier">bivariate_statistics</span><span class="special">.</span><span class="identifier">hpp</span></code>
        </li>
<li class="listitem">
          Add absolute Gini coe