dagitty: isCollider – R documentation

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isCollider

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" )) )

dagitty

Graphical Analysis of Structural Causal Models

v0.3-1

GPL-2

Authors

Johannes Textor, Benito van der Zander, Ankur Ankan

Initial release

2021-01-20