Max lag

[BjarkeHautop]

Something like this you had in mind @ekstroem?

Allows you to do max_lag(<integer>) in knowledge (after tiers are defined), and adds forbidden edges between tiers more than max_lag away:

suppressPackageStartupMessages(library(causalDisco))
knowledge(
  tpc_example,
  tier(
    child ~ starts_with("child"),
    youth ~ starts_with("youth"),
    old ~ starts_with("oldage")
  ),
  max_lag(1)
)
#> <Knowledge: 3 tiers | max_lag = 1 | 6 vars | 4 forbidden>
#>   tier(child): child_x1, child_x2
#>   tier(youth): youth_x3, youth_x4
#>   tier(old): oldage_x5, oldage_x6
#>   forbidden:
#>     child_x1!-->oldage_x5 + oldage_x6
#>     child_x2!-->oldage_x5 + oldage_x6

^{Created on 2026-08-17 with reprex v2.1.1.9000}

[BjarkeHautop]

Another option would be to have it inside tier() as an argument?