op">)</span>, SD<span class="op">=</span><span class="fu"><a href="https://rdrr.io/r/stats/sd.html" class="external-link">sd</a></span><span class="op">(</span><span class="va">x</span><span class="op">)</span>, N<span class="op">=</span><span class="fu"><a href="https://rdrr.io/r/base/nrow.html" class="external-link">nrow</a></span><span class="op">(</span><span class="va">x</span><span class="op">)</span><span class="op">)</span>,<span class="fl">2</span><span class="op">)</span> <span class="op">)</span>