an class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="fl">1</span><span class="op">:</span><span class="fl">750</span><span class="op">)</span>,<span class="op">]</span></span>
<span class="r-in"><span class="va">xvar</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"sex"</span>, <span class="st">"married"</span>, <s