n and not the squared correlation coefficient</li>
<li>Leave-one-out cross-validation should be avoided in favor of shuffle-split or K-fold cross-validation.</li>
</ul></li>
</ul>
</section>
<section id="mixed-effects-models" class="level2">
<h2 class="anchored" data-anchor-id="mixed-effects-models">Mixed-effects models</h2>
<ul>
<li>Mixed effects models should include all possible random effects, subject to the constraint of adequate model convergence.</li>
<li>Convergence should be checked for all models,