at)</a>
<a class="sourceLine" id="cb1-16" data-line-number="16"><span class="co">#&gt;   Y X W      Z</span></a>
<a class="sourceLine" id="cb1-17" data-line-number="17"><span class="co">#&gt; 1 0 0 2   male</span></a>
<a class="sourceLine" id="cb1-18" data-line-number="18"><span class="co">#&gt; 2 0 0 2 female</span></a>
<a class="sourceLine" id="cb1-19" data-line-number="19"><span class="co">#&gt; 3 1 0 1 female</span></a>
<a class="sourceLine" id="cb1-20" data-line-number="20"><span class="co">#&gt; 4 0 0