ensity-function-3" id="toc-probability-density-function-3" class="nav-link" data-scroll-target="#probability-density-function-3">Probability density function</a></li>
  <li><a href="#sampling-statement-3" id="toc-sampling-statement-3" class="nav-link" data-scroll-target="#sampling-statement-3">Sampling statement</a></li>
  <li><a href="#stan-functions-3" id="toc-stan-functions-3" class="nav-link" data-scroll-target="#stan-functions-3">Stan functions</a></li>
  </ul></li>
  <li><a href="#exponential-distribu