ass="r-in"><span></span></span>
<span class="r-in"><span><span class="va">fit_lme2</span> <span class="op">&lt;-</span> <span class="fu">lme</span><span class="op">(</span><span class="va">prothrombin</span> <span class="op">~</span> <span class="va">sex</span>,</span></span>
<span class="r-in"><span>                random <span class="op">=</span> <span class="op">~</span> <span class="va">year</span> <span class="op">|</span> <span class="va">id</span>, data <span class="op">=</span> <span class="va">pbc2