check_contrast_orthogonality

checks to make sure that a contrast of a factor is orthogonal.

check_contrast_orthogonality(x)

Arguments

x

contrast table/matrix

Value

Details

checks to make sure that a contrast of a factor is orthogonal by ensuring (1) sum of each contrast equals 0 and (2) sum of each product of each contrast pair equals 0

Examples

contrast_example <- data.frame(c1 = c(1/3, 1/3, -2/3),
                               c2 = c(-1/2, 1/2, 0))
check_contrast_orthogonality(contrast_example)
#> rule 1. sum of each contrast equals 0 ✓ 
#> rule 2. sum of products of contrast pairs equals 0 ✓