is_collider: Detecting colliders in DAGs
In ggdag: Analyze and Create Elegant Directed Acyclic Graphs

Test if Variable Is Collider

R Documentation

Detecting colliders in DAGs

Description

Detecting colliders in DAGs

Usage

is_collider(.dag, .var, downstream = TRUE)

is_downstream_collider(.dag, .var)

Arguments

`.dag`	an input graph, an object of class `tidy_dagitty` or `dagitty`
`.var`	a character vector of length 1, the potential collider to check
`downstream`	Logical. Check for downstream colliders? Default is `TRUE`.

Value

Logical. Is the variable a collider or downstream collider?

Examples

dag <- dagify(m ~ x + y, m_jr ~ m)
is_collider(dag, "m")
is_downstream_collider(dag, "m_jr")

#  a downstream collider is also treated as a collider
is_collider(dag, "m_jr")

#  but a direct collider is not treated as a downstream collider
is_downstream_collider(dag, "m")

ggdag documentation built on May 31, 2023, 7:48 p.m.