" data-scroll-target="#beta-distribution">Beta distribution</a>
  <ul class="collapse">
  <li><a href="#probability-density-function" id="toc-probability-density-function" class="nav-link" data-scroll-target="#probability-density-function">Probability density function</a></li>
  <li><a href="#distribution-statement" id="toc-distribution-statement" class="nav-link" data-scroll-target="#distribution-statement">Distribution statement</a></li>
  <li><a href="#stan-functions" id="toc-stan-functions" class="nav-l