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Query Node Ancestors

Source: R/query_functions.R
query_ancestors.Rd

Find ancestor nodes for specified variables in a DAG.

Usage

query_ancestors(.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

  • ancestor_set: String representation of ancestor nodes

  • ancestors: List column containing ancestor nodes

  • n_ancestors: Number of ancestors

Examples

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

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