Get all exogenous nodes (nodes with no parents) in a
caugi.
Usage
exogenous(cg, undirected_as_parents = FALSE)
Arguments
- cg
A caugi object.
- undirected_as_parents
Logical; if TRUE, undirected edges are treated
as (possible) parents, if FALSE (default), undirected edges are ignored.
Value
Either a character vector of node names (if a single node is
requested) or a list of character vectors (if multiple nodes are requested).
See also
Other queries:
ancestors(),
children(),
descendants(),
districts(),
edge_types(),
edges(),
is_acyclic(),
is_admg(),
is_caugi(),
is_cpdag(),
is_dag(),
is_empty_caugi(),
is_pdag(),
is_ug(),
m_separated(),
markov_blanket(),
neighbors(),
nodes(),
parents(),
same_nodes(),
spouses(),
subgraph()
Examples
cg <- caugi(
A %-->% B,
B %-->% C,
class = "DAG"
)
exogenous(cg) # "A"
#> [1] "A"
