">data.big5</span><span class="op">)</span>, value<span class="op">=</span><span class="cn">TRUE</span> <span class="op">)</span><span class="op">[</span><span class="fl">1</span><span class="op">:</span><span class="fl">6</span><span class="op">]</span>,</span>
<span>            <span class="fu"><a href="https://rdrr.io/r/base/grep.html" class="external-link">grep</a></span><span class="op">(</span> <span class="st">"N"</span>, <span class="fu"><a href="https://rdrr.io/r/base/colnames.html" class="external