, <span class="op">-</span><span class="fl">1</span><span class="op">]</span></span></span>
<span class="r-in"><span><span class="va">mydata</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/stats/na.fail.html" class="external-link">na.omit</a></span><span class="op">(</span><span class="va">mydata</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="va">sex</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/sam