><span class="op">(</span><span class="va">class</span><span class="op">)</span></span></code></pre></div>
<pre><code><span><span class="co">##         sex age height weight male  IQ</span></span>
<span><span class="co">## Alfred    M  14   69.0  112.5    1 103</span></span>
<span><span class="co">## Alice     F  13   56.5   84.0    0 110</span></span>
<span><span class="co">## Barbara   F  13   65.3   98.0    0  90</span></span>
<span><span class="co">## Carol     F  14   62.8  102.5    0 114</span></span>