Arrange within a group with dplyr

Question

I am using the library(nycflights13) and I use the following command to group_by month and day, select the top 3 rows within each group and then sort in descending order wit

Answer 1

You need to add .by_group=T to arrange within groups.

flights %>%
   group_by(month, day) %>%
   top_n(3, dep_delay) %>%
   arrange(dep_delay, .by_group = TRUE)