tidy_add_contrasts: Add contrasts type for categorical variables

In broom.helpers: Helpers for Model Coefficients Tibbles

Add contrasts type for categorical variables

Description

Add a contrasts column corresponding to contrasts used for a categorical variable and a contrasts_type column equal to "treatment", "sum", "poly", "helmert", "other" or "no.contrast".

Usage

tidy_add_contrasts(x, model = tidy_get_model(x), quiet = FALSE)

Arguments

x	(data.frame) A tidy tibble as produced by ⁠tidy_*()⁠ functions.
model	(a model object, e.g. glm) The corresponding model, if not attached to x.
quiet	(logical) Whether broom.helpers should not return a message when tidy_disambiguate_terms() was already applied

Details

If the variable column is not yet available in x, tidy_identify_variables() will be automatically applied.

See Also

Other tidy_helpers: tidy_add_coefficients_type(), tidy_add_estimate_to_reference_rows(), tidy_add_header_rows(), tidy_add_n(), tidy_add_pairwise_contrasts(), tidy_add_reference_rows(), tidy_add_term_labels(), tidy_add_variable_labels(), tidy_attach_model(), tidy_disambiguate_terms(), tidy_group_by(), tidy_identify_variables(), tidy_plus_plus(), tidy_remove_intercept(), tidy_select_variables()

Examples

df <- Titanic |>
  dplyr::as_tibble() |>
  dplyr::mutate(Survived = factor(Survived, c("No", "Yes")))

glm(
  Survived ~ Class + Age + Sex,
  data = df, weights = df$n, family = binomial,
  contrasts = list(Age = contr.sum, Class = "contr.helmert")
) |>
  tidy_and_attach() |>
  tidy_add_contrasts()

broom.helpers documentation built on April 12, 2025, 2:26 a.m.