n> <span class="op">~</span> <span class="va">Days</span> <span class="op">+</span> <span class="op">(</span><span class="fl">1</span><span class="op">|</span><span class="va">Subject</span><span class="op">)</span>, <span class="va">sleepstudyNA</span>, na.action<span class="op">=</span><span class="va">na.exclude</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="va">ss</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/stats/simulate.html" cl