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Removes every first edge on a proper causal path from x.
If x is a MAG or PAG, then only “visible” directed
edges are removed (Zhang, 2008).
backDoorGraph(x)the input graph, a DAG, MAG, PDAG, or PAG.
J. Zhang (2008), Causal Reasoning with Ancestral Graphs. Journal of Machine Learning Research 9: 1437-1474.
g <- dagitty( "dag { x <-> m <-> y <- x }" )
backDoorGraph( g ) # x->y edge is removed
g <- dagitty( "mag { x <-> m <-> y <- x }" )
backDoorGraph( g ) # x->y edge is not removed
g <- dagitty( "mag { x <-> m <-> y <- x <- i }" )
backDoorGraph( g ) # x->y edge is removed
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