s="fu"><a href="https://rdrr.io/r/base/attr.html" class="external-link">attr</a></span><span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/stats/vcov.html" class="external-link">vcov</a></span><span class="op">(</span><span class="va">est</span>, ssc <span class="op">=</span> <span class="fu">ssc</span><span class="op">(</span>K.fixef <span class="op">=</span> <span class="st">"full"</span>, K.exact <span class="op">=</span> <span class="cn">TRUE</span><span class="op">)</span>, attr <span 