//rdrr.io/r/base/summary.html" class="external-link">summary</a></span><span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/stats/lm.html" class="external-link">lm</a></span><span class="op">(</span><span class="va">y</span> <span class="op">~</span> <span class="va">X</span><span class="op">[</span>,<span class="va">i</span><span class="op">]</span><span class="op">)</span><span class="op">)</span><span class="op">$</span><span class="va">r.squared</span></span>
<span><span class="fu"><a hr