#' Find Exogenous Variables
#'
#' `node_exogenous` tags exogenous variables given an exposure and
#' outcome. `ggdag_exogenous` plots all exogenous variables. See
#' [dagitty::exogenousVariables()] for details.
#'
#' @param .dag,.tdy_dag input graph, an object of class `tidy_dagitty` or
#' `dagitty`
#' @param ... additional arguments passed to `tidy_dagitty()`
#' @inheritParams geom_dag
#'
#' @return a `tidy_dagitty` with an `exogenous` column for
#' exogenous variables or a `ggplot`
#' @export
#'
#' @examples
#' dag <- dagify(y ~ x1 + x2 + x3, b ~ x1 + x2)
#' ggdag_exogenous(dag)
#' node_exogenous(dag)
#'
#' @rdname exogenous
#' @name Exogenous Variables
node_exogenous <- function(.dag, ...) {
.dag <- if_not_tidy_daggity(.dag, ...)
exogenous_vars <- dagitty::exogenousVariables(pull_dag(.dag))
dplyr::mutate(
.dag,
exogenous = ifelse(name %in% exogenous_vars, "exogenous", NA)
)
}
#' @rdname exogenous
#' @export
ggdag_exogenous <- function(
.tdy_dag,
...,
size = 1,
edge_type = c("link_arc", "link", "arc", "diagonal"),
node_size = 16,
text_size = 3.88,
label_size = text_size,
text_col = "white",
label_col = "black",
edge_width = 0.6,
edge_cap = 8,
arrow_length = 5,
use_edges = TRUE,
use_nodes = TRUE,
use_stylized = FALSE,
use_text = TRUE,
use_labels = FALSE,
text = NULL,
label = NULL,
node = deprecated(),
stylized = deprecated()
) {
p <- if_not_tidy_daggity(.tdy_dag, ...) %>%
node_exogenous() %>%
ggplot2::ggplot(aes_dag(color = exogenous)) +
scale_adjusted() +
breaks("exogenous")
p <- p + geom_dag(
size = size,
edge_type = edge_type,
node_size = node_size,
text_size = text_size,
label_size = label_size,
text_col = text_col,
label_col = label_col,
edge_width = edge_width,
edge_cap = edge_cap,
arrow_length = arrow_length,
use_edges = use_edges,
use_nodes = use_nodes,
use_stylized = use_stylized,
use_text = use_text,
use_labels = use_labels,
text = !!rlang::enquo(text),
label = !!rlang::enquo(label),
node = node,
stylized = stylized
)
p
}
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