class="op">)</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="co">## ... but if simulating multiple responses (for efficiency),</span></span></span>
<span class="r-in"><span><span class="co">## need to use na.action=na.exclude in order to have proper length of data</span></span></span>
<span class="r-in"><span><span class="va">fm1</span> <span class="op">&lt;-</span> <span class="fu"><a href="lmer.html">lmer</a></span><span class="op">(</span><span class="va">Reaction</spa