igma);</span>
<span id="cb6-12"><a href="#cb6-12" aria-hidden="true" tabindex="-1"></a>  <span class="dt">vector</span>[N] err = y_test_sim - y_hat;</span>
<span id="cb6-13"><a href="#cb6-13" aria-hidden="true" tabindex="-1"></a>}</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
<p>The prediction <code>y_test_hat</code> is defined in the generated quantities block using the general form involving all uncertainty. The posterior of this quantity c