n>
<span class="co">#&gt; 4    18</span>
<span class="co">#&gt; 5    28</span>
<span class="co">#&gt; 6    23</span></code></pre></div>
<ul>
<li><code>drop_all_na</code></li>
</ul>
<p>This drops columns where all values are missing.</p>
<div class="sourceCode" id="cb49"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span class="va">test2</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/data.frame.html" class="external-link">data.frame</a></span><span clas