span><span class="op">)</span>
<span class="co">#&gt;   school   normexam schgend    schavg      vr     intake   standLRT sex type</span>
<span class="co">#&gt; 1      1  0.2613242   mixed 0.1661752 mid 50% bottom 25%  0.6190592   F  Mxd</span>
<span class="co">#&gt; 2      1  0.1340672   mixed 0.1661752 mid 50%    mid 50%  0.2058022   F  Mxd</span>
<span class="co">#&gt; 3      1 -1.7238820   mixed 0.1661752 mid 50%    top 25% -1.3645760   M  Mxd</span>
<span class="co">#&gt; 4      1  0.9675862   mixed 0.