dyr.tidyverse.org/reference/nest.html" class="external-link">nest</a></span><span class="op">(</span></span></span>
<span class="r-in"><span>    results <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="va">measure_abbr</span>, <span class="va">observed</span>, <span class="va">denominator</span><span class="op">)</span>,</span></span>
<span class="r-in"><span>    .messages <span class="op">=</span> <spa