ass="kw">length</span>(<span class="kw">unique</span>(official_name))<span class="op">-</span><span class="dv">1</span>, <span class="dt">n =</span> .N), by =<span class="st"> </span>group]</span>
<span id="cb11-5"><a href="#cb11-5" aria-hidden="true"></a><span class="op">&gt;</span><span class="st"> </span>qual<span class="op">$</span>ferrors &lt;-<span class="st"> </span>qual<span class="op">$</span>errors<span class="op">/</span>qual<span class="op">$</span>n</span>
<span id="cb11-6"><a href="#cb11-6" ar