#' Get xlevels used in the model
#'
#' @param model (a model object, e.g. `glm`)\cr
#' A model object.
#' @export
#' @family model_helpers
#' @examples
#' lm(hp ~ mpg + factor(cyl), mtcars) |>
#' model_get_xlevels()
model_get_xlevels <- function(model) {
UseMethod("model_get_xlevels")
}
#' @export
#' @rdname model_get_xlevels
model_get_xlevels.default <- function(model) {
xlevels <- tryCatch(
model |> purrr::chuck("xlevels"),
error = function(e) {
NULL # nocov
}
)
if (is.null(xlevels)) {
xlevels <- tryCatch(
stats::.getXlevels(
model |> model_get_terms(),
model |> model_get_model_frame()
),
error = function(e) {
NULL # nocov
}
)
}
xlevels |> .add_xlevels_for_logical_variables(model)
}
.add_xlevels_for_logical_variables <- function(xlevels, model) {
log_vars <- model |>
model_list_variables() |>
dplyr::filter(.data$var_class == "logical") |>
purrr::pluck("variable")
for (v in setdiff(log_vars, names(xlevels))) {
xlevels[[v]] <- c("FALSE", "TRUE")
}
xlevels
}
#' @export
#' @rdname model_get_xlevels
model_get_xlevels.lmerMod <- function(model) {
stats::model.frame(model) |>
lapply(levels) |>
purrr::compact() |> # keep only not null
.add_xlevels_for_logical_variables(model)
}
#' @export
#' @rdname model_get_xlevels
model_get_xlevels.glmerMod <- model_get_xlevels.lmerMod
#' @export
#' @rdname model_get_xlevels
model_get_xlevels.felm <- model_get_xlevels.lmerMod
#' @export
#' @rdname model_get_xlevels
model_get_xlevels.brmsfit <- model_get_xlevels.lmerMod
#' @export
#' @rdname model_get_xlevels
model_get_xlevels.glmmTMB <- model_get_xlevels.lmerMod
#' @export
#' @rdname model_get_xlevels
model_get_xlevels.plm <- model_get_xlevels.lmerMod
#' @export
#' @rdname model_get_xlevels
model_get_xlevels.model_fit <- function(model) {
model_get_xlevels(model$fit)
}
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