Please see https://merck.github.io/boxly/articles/ for the full documentation. Here is only a minimal example:
library("boxly")
meta_boxly(
boxly_adsl,
boxly_adlb,population_term = "apat",
observation_term = "wk12",
observation_subset = AVISITN <= 12 & !is.na(CHG)
|>
) prepare_boxly() |>
boxly()