      Social Sciences: Sociology</span></span></code></pre></div>
<p>The <code>abbrev</code>, <code>number</code>, and
<code>discipline_midfield</code> columns have no NA values, so they
might be useful if one is filtering for specific course types. The
<code>course</code> column, on the other hand, has a high number of NA
values.</p>
<div class="sourceCode" id="cb8"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="co"># Many NA values in this column</span></span>
<span><span