an>  $ enroll  : int  0 0 0 0 0 0 0 0 0 0 ...</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>  $ KWW     : int  15 35 42 25 34 38 41 46 32 34 ...</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>  $ IQ      : int  NA 93 103 88 108 85 119 108 96 97 ...</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>  $ married : int  1 1 1 1 1 1 1 1 4 1 ...</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>  $ libcrd14: int  0 1 1 1 0 1 1 1 0 1 ...</span>
<span class="r-out 