n><span class="co">#&gt; goose    9   10     11    12</span></span>
<span><span class="fu"><a href="../reference/aggregate_byname.html">aggregate_byname</a></span><span class="op">(</span><span class="va">m</span><span class="op">)</span></span>
<span><span class="co">#&gt;       George John Paul Ringo</span></span>
<span><span class="co">#&gt; duck      10    6    8    12</span></span>
<span><span class="co">#&gt; goose     11    9   10    12</span></span></code></pre></div>
<p>An <code>aggregation_map</co