lass="fu">mixed_model</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> <span class="op">~</span> <span class="fl">1</span> <span class="op">|</span> <span class="va">id</span>, data <span class="op">=</span> <span class="va">DF</span>,</span></span>
<span class="r-in"><span>                   family <span class="op">=</span> 