/span>, <span class="st">"W2"</span><span class="op">)</span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co">#Run random-intercept 2-level model with group-mean centering</span></span></span>
<span class="r-in"><span><span class="va">grp_centered</span> <span class="op">&lt;-</span> <span class="fu">mix</span><span class="op">(</span><span class="va">Reaction</span> <span class="op">~</span> <span class="va">Days</span> <span class="o