dot-warn_if_onelevel: Warn if one level factor

In contrastable: Consistent Contrast Coding for Factors

Warn if one level factor

Description

Factors with only one level happen if a character vector is converted to a factor using factor() but without specifying anything for the levels parameter. If you try to access or set the contrasts for a one-level factor, you'll get an error that contrasts are undefined because you have 0 degrees of freedom.

Usage

.warn_if_onelevel(
  one_level_factors = NULL,
  model_data = NULL,
  attempting_factors = NULL
)

Arguments

one_level_factors	Character vector of which factors are one level
model_data	Model data to look for factor columns
attempting_factors	Factor column names to check

Value

Nothing, warns if factors with only one level are detected.

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