n>
<span class="r-out co"><span class="r-pr">#&gt;</span> group1       -0.8878  0.4816 -1.8437 0.0652272</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> year:group1  -0.0517  0.0195 -2.6534 0.0079694</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> Integration:</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> method: adaptive Gauss-Hermite quadrature rule</span>
<span class="r-out co"><span class="r-pr">#&