dot-split_if_language: Split contrast function using parens

In contrastable: Consistent Contrast Coding for Factors

Split contrast function using parens

Description

If something like set_contrasts(df, var ~ sum_code()) then what's extracted from the formula isn't the symbol for the function sum_code but a language object. This can be converted to a list to extract the function symbol and then any arguments provided in the parens. The latter needs to be evaluated in the original environment, for example if ⁠set_contrasts(df, var ~ sum_code(scores=c(.1,.5,.6))⁠ is called, the scores list would not evaluate the c(...) call, yielding an error that the scores argument isn't the right length (because it would be length 1, not 3).

Usage

.split_if_language(params, var_envir)

Arguments

params	Parameters extracted from formula parsing
var_envir	Environment to evaluate expressions in

Value

Parameter list with code_by set to the correct symbol & an additional list entry for other arguments, which will be empty if no arguments are provided.

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