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Query Node Children

Source: R/query_functions.R
query_children.Rd

Find child nodes for specified variables in a DAG.

Usage

query_children(.tdy_dag, .var = NULL)

Arguments

.tdy_dag

A tidy_dagitty or dagitty object

.var

Character vector of variables to query. If NULL, returns parents for all nodes.

Value

A tibble with columns:

  • node: The node

  • child_set: String representation of child nodes

  • children: List column containing child nodes

  • n_children: Number of children

Examples

library(ggdag)
dag <- dagify(
  y ~ x + z,
  x ~ w
)

query_children(dag)
#> # A tibble: 4 × 4
#>   node  child_set children  n_children
#>   <chr> <chr>     <list>         <int>
#> 1 w     {x}       <chr [1]>          1
#> 2 x     {y}       <chr [1]>          1
#> 3 y     NA        <chr [1]>          0
#> 4 z     {y}       <chr [1]>          1
query_children(dag, .var = "x")
#> # A tibble: 1 × 4
#>   node  child_set children  n_children
#>   <chr> <chr>     <list>         <int>
#> 1 x     {y}       <chr [1]>          1