u"><a href="https://rdrr.io/r/base/NA.html" class="external-link">is.na</a></span><span class="op">(</span><span class="va">course</span><span class="op">$</span><span class="va">discipline_midfield</span><span class="op">)</span><span class="op">)</span></span>
<span><span class="co">#&gt; [1] 0</span></span></code></pre></div>
</div>
<div class="section level2">
<h2 id="term">
<code>term</code><a class="anchor" aria-label="anchor" href="#term"></a>
</h2>
<p>Contains one observation per student per term.</