Post #2460366

@DataAngler@vis.social mutate and filter also have the .by argument: df |> summarise(.by = c(species, island), n=n()) |> mutate(.by = species, Pct = n/sum(n)) The only difference is the order TIL that dplyr will warn about grouped operations and further operations that are ungrouped: From your first example: `summarise()` has regrouped the output. ℹ Summaries were computed grouped by species and island. ℹ Output is grouped by species. ℹ Use `summarise(.groups = "drop_last")` to silence this message.