dconnected
From dagitty v0.2-2
by Johannes Textor
d-Separation
A set Z d-separates a path p if (1) Z contains a non-collider
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().
Usage
dconnected(x, X, Y = list(), Z = list())
dseparated(x, X, Y = list(), Z = list())Arguments
- x
- the input graph, a DAG, PDAG, or MAG.
- X
- vector of variable names.
- Y
- vector of variable names.
- Z
- vector of variable names.
dseparated(x,X,Y,Z)checks if all paths between X and Y are d-separated by Z.dconnected(x,X,Y,Z)checks if at least one path between X and Y is not d-separated by Z.
Details
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.
Examples
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() ) # TRUE
dseparated( "dag{x->m->y}", "x", "y", c("m") ) # FALSE
Community examples
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