List contrasts used by a model

Usage

model_list_contrasts(model)

# Default S3 method
model_list_contrasts(model)

Arguments

model: (a model object, e.g. glm)
A model object.

Value

A tibble with three columns:

variable: variable name
contrasts: contrasts used
contrasts_type: type of contrasts ("treatment", "sum", "poly", "helmert", "sdiff, "other" or "no.contrast")
reference: for variables with treatment, SAS or sum contrasts, position of the reference level

Details

For models with no intercept, no contrasts will be applied to one of the categorical variable. In such case, one dummy term will be returned for each level of the categorical variable.

Other model_helpers: model_compute_terms_contributions(), model_get_assign(), model_get_coefficients_type(), model_get_contrasts(), model_get_model(), model_get_model_frame(), model_get_model_matrix(), model_get_n(), model_get_nlevels(), model_get_offset(), model_get_pairwise_contrasts(), model_get_response(), model_get_response_variable(), model_get_terms(), model_get_weights(), model_get_xlevels(), model_identify_variables(), model_list_higher_order_variables(), model_list_terms_levels(), model_list_variables()

Examples

glm(
  am ~ mpg + factor(cyl),
  data = mtcars,
  family = binomial,
  contrasts = list(`factor(cyl)` = contr.sum)
) |>
  model_list_contrasts()
#> # A tibble: 1 × 4
#>   variable    contrasts reference contrasts_type
#>   <chr>       <chr>         <int> <chr>         
#> 1 factor(cyl) contr.sum         3 sum