</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/mutate-joins.html" class="external-link">left_join</a></span><span class="op">(</span><span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/count.html" class="external-link">count</a></span><span class="op">(</span><span class="va">trx</span>, <span class="va">investor</span><span class="op">)</span>, by <span class="op">=</span> <span class="st">"