- Logical comparisons, `<`, `<=`, `>`, `>=`, `!=`, and `==`
- Ranking: there are a number of ranking functions, but you should start with `min_rank()`. There is also `row_number()`, `dense_rank()`, `percent_rank()`, `cume_dist()`, `ntile()`
## See you in [R#5: Pipping and grouping](https://can.gitbiopages.ens-lyon.fr/R_basis/session_5/)
## See you in [R#5: Pipping and grouping](https://can.gitbiopages.ens-lyon.fr/R_basis/session_5.html)
