Construct a sum-to-zero contrast between two logical expressions.
Usage
pair_contrast(A, B, name, where = NULL)
Arguments
- A
A formula representing the first logical expression in the contrast.
- B
A formula representing the second logical expression in the contrast.
- name
A character string specifying the name of the contrast (mandatory).
- where
An optional formula specifying the subset over which the contrast is computed.
Value
A pair_contrast_spec object containing the sum-to-zero contrast between the two logical expressions.
Examples
# A hypothetical experiment with a factor 'category' that takes on values of 'face' and 'scene'
pair_contrast(~ category == "face", ~ category == "scene", name="face_scene")
#> contrast: face_scene
#> A: ~category == "face"
#> B: ~category == "scene"