queValues
## Number of unique values: 1
## $spotifysong$centralValue
## Mode: &quot;Irrelevant&quot;
## $spotifysong$refCat
## Reference category: Irrelevant</code></pre>
</div>
<div id="c.2" class="section level3">
<h3>2c.2</h3>
<p><strong>First, try calling <code>allSummaryFunctions()</code> to see what summary functions are already available. We want <code>refCat()</code> to be added to the output of this function. This is done by use of <code>summaryFunction()</code>. Fill in the missing pieces in the c