a practical diagnostic.
If there are any divergences after warmup,
then the samples may be biased.</p>
<p>If the divergent transitions cannot be eliminated by increasing the
<code>adapt_delta</code> parameter, we have to find a different way to
write the model that is logically equivalent but simplifies the
geometry of the posterior distribution. This problem occurs frequently
with hierarchical models and one of the simplest examples is Neal’s
Funnel, which is discussed in the
<a href="https://mc-stan.org