isCollider {dagitty} | R Documentation |
Test for Colliders
Description
Returns TRUE
if three given variables form a collider in a given graph.
Usage
isCollider(x, u, v, w)
Arguments
x |
the input graph, a DAG. |
u |
the first endpoint of the putative collider |
v |
the midpoint of the putative collider |
w |
the second endpoint of the putative collider |
Examples
g1 <- dagitty("dag{X -> Y -> Z}")
stopifnot( isTRUE(!isCollider( g1, "X", "Y", "Z" )) )
g2 <- dagitty("dag{X -> Y <- Z }")
stopifnot( isTRUE(isCollider( g2, "X", "Y", "Z" )) )
[Package dagitty version 0.3-4 Index]