</span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># Fit a model</span></span></span>
<span class="r-in"><span><span class="va">fm1</span> <span class="op">&lt;-</span> <span class="fu"><a href="mixed_model.html">mixed_model</a></span><span class="op">(</span>fixed <span class="op">=</span> <span class="va">y</span> <span class="op">~</span> <span class="va">year</span> <span class="op">*</span> <span class="va">group</span>, random <span class="op">=</span> <sp