dplyr - Group by and select TOP x %

Question

Using the package dplyr and the function sample_frac it is possible to sample a percentage from every group. What I need is to first sort the elements in every

Answer 1

I believe this gets to the answer you're looking for.

library(dplyr)

mtcars %>% select(gear, wt) %>% 
  group_by(gear) %>% 
  arrange(gear, wt) %>% 
  filter(row_number() / n() <= .2)