See the FAQ: How to do a minimal reproducible example reprex for beginners for how to solicit more specific answers.
For id a, the three columns will sum to 3, 1, and 3, respectively when using group_by and count after library(dplyr)
See the FAQ: How to do a minimal reproducible example reprex for beginners for how to solicit more specific answers.
For id a, the three columns will sum to 3, 1, and 3, respectively when using group_by and count after library(dplyr)