n><span class="fu">::</span><span class="fu"><a href="https://rdrr.io/pkg/nlme/man/lme.html">lme</a></span><span class="op">(</span><span class="va">mathgain</span> <span class="op">~</span> <span class="fl">1</span>, random <span class="op">=</span> <span class="op">~</span><span class="fl">1</span><span class="op">|</span><span class="va">schoolid</span><span class="op">/</span><span class="va">classid</span>, data <span class="op">=</span> <span class="va">classroom</span><span class="op">)</span></code>