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<p>As is the convention in BUGS, the authors define normal distributions by a precision parameter <span class="math inline">\(\tau\)</span> as opposed to the standard deviation parameter <span class="math inline">\(\sigma\)</span> used here. We have re-specified the model to comply with the Stan convention of using standard deviation. The authors use a normal hyperprior on <span class="math inline">\(\mu\)</span>, and a gamma hyperprior on <span class="math inline">\(\tau\)</span>, equivalent to an invers