kage <span class="op">=</span> <span class="st">"WWGbook"</span><span class="op">)</span>
<span class="fu"><a href="https://rdrr.io/r/utils/head.html">head</a></span><span class="op">(</span><span class="va">classroom</span><span class="op">)</span>
<span class="co">#&gt;   sex minority mathkind mathgain   ses yearstea mathknow housepov mathprep</span>
<span class="co">#&gt; 1   1        1      448       32  0.46        1       NA    0.082     2.00</span>
<span class="co">#&gt; 2   0        1      460      