dot-make_parameters: Make parameters for contrast code call

In contrastable: Consistent Contrast Coding for Factors

Make parameters for contrast code call

Description

Given a formula, recursively go through the abstract syntax tree and extract the necessary parameters for use_contrasts(). While this method is more involved than extracting from a parsed string representation, I think it handles matrix calls better since it plucks the call right out of the syntax tree.

Usage

.make_parameters(
  formula,
  params = list(factor_col = NA, code_by = NA, reference_level = NA, intercept_level =
    NA, drop_trends = NA, labels = NULL, as_is = FALSE),
  env = NULL,
  verbose = TRUE
)

Arguments

formula	Formula given by user
params	Parameter accumulator
env	Environment for the formula, on the first recursion this will be pulled from formula and then passed to subsequent recursions. Needed to check whether a function is actually a function.
verbose	Logical, default TRUE, whether to show drop_trends warning if used incorrectly

Value

Named list of parameters that can be evaluated in .process_contrasts()

contrastable documentation built on Oct. 1, 2024, 5:07 p.m.