Query Adjustment Sets

Find adjustment sets that close backdoor paths between exposure and outcome. Unlike dag_adjustment_sets(), this function returns a tibble with the adjustment sets as list columns rather than a tidy_dagitty object.

Usage

query_adjustment_sets(
  .tdy_dag,
  exposure = NULL,
  outcome = NULL,
  type = c("minimal", "canonical", "all"),
  effect = c("total", "direct"),
  max.results = Inf
)

Arguments

.tdy_dag

A tidy_dagitty or dagitty object

exposure

A character vector of exposure variable names. If NULL, uses the exposure defined in the DAG.

outcome

A character vector of outcome variable names. If NULL, uses the outcome defined in the DAG.

type

Character string specifying the type of adjustment sets to find. Options are "minimal" (default), "canonical", or "all".

effect

Character string specifying the effect type. Options are "total" (default) or "direct".

max.results

Maximum number of adjustment sets to return. Default is Inf.

Value

A tibble with columns:

• set_id: Integer identifier for each adjustment set

• type: Type of adjustment set (minimal, canonical, or all)

• effect: Effect type (total or direct)

• set: String representation of the adjustment set (e.g., "{a, b, c}")

• variables: List column containing the variables in each set

Examples

library(ggdag)
dag <- dagify(
  y ~ x + z,
  x ~ z,
  exposure = "x",
  outcome = "y"
)

query_adjustment_sets(dag)
#> # A tibble: 1 × 5
#>   set_id type    effect set   variables   
#>    <int> <chr>   <chr>  <chr> <named list>
#> 1      1 minimal total  {z}   <chr [1]>