se of multimodal distributions with well-separated
modes, this leads to an ESS estimate that is close to the number of
distinct modes that are found.</p>
<p>Bulk-ESS refers to the effective sample size based on the rank
normalized draws. This does not directly compute the ESS relevant for
computing the mean of the parameter, but instead computes a quantity
that is well defined even if the chains do not have finite mean or
variance. Overall bulk-ESS estimates the sampling efficiency for the
location of the d