ass="co"># refit model with na.exclude</span>
<span class="va">fm1.NA</span> <span class="op">&lt;-</span> <span class="fu">lme4</span><span class="fu">::</span><span class="fu"><a href="https://rdrr.io/pkg/lme4/man/lmer.html">lmer</a></span><span class="op">(</span><span class="va">normexam</span> <span class="op">~</span> <span class="va">standLRT</span> <span class="op">+</span> <span class="op">(</span><span class="fl">1</span> <span class="op">|</span> <span class="va">school</span><span class="op">)</