"r-pr">#&gt;</span> </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> $df.K</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] 6</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> </span>
<span class="r-in"><span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># K.fixef = FALSE</span></span></span>
<span class="r-in"><span><span class="co">#  =&gt; adjustment K = 1 (i.e. only x)</span></span></span>
<span class="r-in"><s