="lmer.html">lmer</a></span><span class="op">(</span><span class="va">Reaction</span><span class="op">~</span><span class="va">Days</span><span class="op">+</span><span class="op">(</span><span class="va">Days</span><span class="op">|</span><span class="va">Subject</span><span class="op">)</span>,<span class="va">sleepstudy</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="va">dd</span> <span class="op">&lt;-</span> <span class="fu">devfun2</span><span class="op">(</span><s