cts. Finally, if <code>"nonnested"</code>, then
the number of parameters is equal to the number of variables plus the number of
fixed-effects that <em>are not</em> nested in the clusters used to cluster the standard-errors.</p></dd>


<dt id="arg-k-exact">K.exact<a class="anchor" aria-label="anchor" href="#arg-k-exact"></a></dt>
<dd><p>Logical, default is <code>FALSE</code>. If there are 2 or more fixed-effects,
these fixed-effects they can be irregular, meaning they can provide the same information.
If so,