></span><span class="op">(</span><span class="fl">4</span>, mean <span class="op">=</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="op">-</span><span class="fl">1</span>,<span class="op">-</span><span class="fl">4</span>,<span class="fl">4</span>,<span class="fl">1</span><span class="op">)</span><span class="op">)</span><span class="op">}</span>
  <span class="op">}</span><span class="op">)</span>
  <span class="kw"><a h