">(</span><span class="va">rsk</span>, <span class="va">time</span> <span class="op">&lt;</span> <span class="fu"><a href="https://rdrr.io/r/base/mean.html" class="external-link">mean</a></span><span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/base/range.html" class="external-link">range</a></span><span class="op">(</span><span class="va">rsk</span><span class="op">[[</span><span class="st">"time"</span><span class="op">]</span><span class="op">]</span><span class="op">)</span><span class