Description Usage Arguments Details Examples
A set Z dseparates a path p if (1) Z contains a noncollider
on p, e.g. x>m>y with Z=c("m")
; or (2) some collider on p is not
on Z, e.g. x>m<y with Z=c()
.
1 2 3  dconnected(x, X, Y = list(), Z = list())
dseparated(x, X, Y = list(), Z = list())

x 
the input graph, a DAG, PDAG, or MAG. 
X 
vector of variable names. 
Y 
vector of variable names. 
Z 
vector of variable names.

The functions also work for mixed graphs with directed, undirected, and bidirected edges. The definition of a collider in such graphs is: a node where two arrowheads collide, e.g. x<>m<y but not x>m–y.
1 2 3 4  dconnected( "dag{x>m>y}", "x", "y", c() ) # TRUE
dconnected( "dag{x>m>y}", "x", "y", c("m") ) # FALSE
dseparated( "dag{x>m>y}", "x", "y", c() ) # FALSE
dseparated( "dag{x>m>y}", "x", "y", c("m") ) # TRUE

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