is_valid_backdoor: Is a backdoor set valid?

In caugi: Causal Graph Interface

Is a backdoor set valid?

Description

Checks whether Z is a valid backdoor adjustment set for ⁠X --> Y⁠.

Usage

is_valid_backdoor(
  cg,
  X = NULL,
  Y = NULL,
  Z = NULL,
  X_index = NULL,
  Y_index = NULL,
  Z_index = NULL
)

Arguments

cg	A caugi object.
X, Y	Single node names.
Z	Optional node set for conditioning
X_index, Y_index, Z_index	Optional 1-based indices.

Value

Logical value indicating if backdoor is valid or not.

See Also

Other adjustment: adjustment_set(), all_adjustment_sets_admg(), all_backdoor_sets(), d_separated(), is_valid_adjustment_admg(), minimal_separator()

Examples

cg <- caugi(
  C %-->% X,
  X %-->% F,
  X %-->% D,
  A %-->% X,
  A %-->% K,
  K %-->% Y,
  D %-->% Y,
  D %-->% G,
  Y %-->% H,
  class = "DAG"
)

is_valid_backdoor(cg, X = "X", Y = "Y", Z = NULL) # FALSE
is_valid_backdoor(cg, X = "X", Y = "Y", Z = "K") # TRUE
is_valid_backdoor(cg, X = "X", Y = "Y", Z = c("A", "C")) # TRUE

caugi documentation built on Oct. 28, 2026, 1:07 a.m.