bnlearn (version 3.1)

dsep: Test d-separation

Description

Check whether two nodes are d-separated.

Usage

dsep(bn, x, y, z)

Arguments

bn

an object of class bn.

x,y

a character string, the label of a node.

z

an optional vector of character strings, the label of the (candidate) d-separating nodes. It defaults to the empty set.

Value

• dsep returns TRUE if x and y are d-separated by z, and FALSE otherwise.

References

Koller D, Friedman N (2009). Probabilistic Graphical Models: Principles and Techniques. MIT Press.

Examples

bn = model2network("[A][C|A][B|C]")
dsep(bn, "A", "B", "C")
# [1] TRUE
bn = model2network("[A][C][B|A:C]")
dsep(bn, "A", "B", "C")
# [1] FALSE