"anchor" href="#arg-k-fixef"></a></dt>
<dd><p>Character scalar equal to <code>"nonnested"</code> (default), <code>"none"</code> or <code>"full"</code>. In
the small sample adjustment, how to account for the fixed-effects parameters. If <code>"none"</code>,
the fixed-effects parameters are discarded, meaning the number of parameters (<code>K</code>) is only
equal to the number of variables. If <code>"full"</code>, then the number of parameters is equal to
the number of variables plus the number of fixed-effe