e reparameterization section
<a href="https://mc-stan.org/docs/stan-users-guide/reparameterization-section.html" class="uri">https://mc-stan.org/docs/stan-users-guide/reparameterization-section.html</a>.
This program defines a distribution which
exemplifies the difficulties of sampling from some hierarchical models:</p>
<pre><code>parameters {
  real y;
  vector[9] x;
}
model {
  y ~ normal(0, 3);
  x ~ normal(0, exp(y/2));
}</code></pre>
<p>This program is available on GitHub: <a href="https://github.com/s