><span class="op">)</span>, <span class="va">.N</span>, by <span class="op">=</span> <span class="st">"institution"</span><span class="op">]</span></span>
<span><span class="co">#&gt;      institution     N</span></span>
<span><span class="co">#&gt;           &lt;char&gt; &lt;int&gt;</span></span>
<span><span class="co">#&gt; 1: Institution B 45660</span></span>
<span><span class="co">#&gt; 2: Institution C 26712</span></span>
<span><span class="co">#&gt; 3: Institution J 25183</span></span>
<span></span>
<