n>
<span class="r-out co"><span class="r-pr">#&gt;</span>     "D")),</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>   jointype = "INNER", by = c('AUC'))</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> $d1</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] "AUC" "R2" </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> $d2</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] "AUC"