"3"><span class="kw">levels</span>(dat<span class="op">$</span>Z)</a>
<a class="sourceLine" id="cb4-4" data-line-number="4"><span class="co">#&gt; [1] &quot;female&quot; &quot;male&quot;</span></a>
<a class="sourceLine" id="cb4-5" data-line-number="5">adjusted &lt;-<span class="st"> </span><span class="kw">cbind</span>(<span class="kw">rep</span>(<span class="kw">levels</span>(dat<span class="op">$</span>W), <span class="dv">2</span>), <span class="kw">rep</span>(<span class="kw">levels</span>(dat<span clas