multivariate.html"><a href="multivariate.html#hierarchical-clustering"><i class="fa fa-check"></i><b>16.3.2</b> Hierarchical clustering</a></li>
</ul></li>
<li class="chapter" data-level="16.4" data-path="multivariate.html"><a href="multivariate.html#dimensionality-reduction"><i class="fa fa-check"></i><b>16.4</b> Dimensionality reduction</a>
<ul>
<li class="chapter" data-level="16.4.1" data-path="multivariate.html"><a href="multivariate.html#principal-component-analysis"><i class="fa fa-check"></i><b>16.4.