n class="r-in"><span><span class="co">##############</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># include random slopes</span></span></span>
<span class="r-in"><span><span class="va">fm1_slp</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/stats/update.html" class="external-link">update</a></span><span class="op">(</span><span class="va">fm1</span>, random <span class="op">=</span> <span class="op">~</span> <span cla