I really appreciated that I found StackOverflow and your answers. I have a problem preparing orthogonal designs. I have two labeled alternatives. The first alternative has 5 attributes and the second alternative has 4,4,4,4,3 levels respectively. The second alternative has 6 attributes and 4,4,4,4,4,2 levels respectively. I saw some people use this type of design. But I am not sure if it valid for labelled design or just valid for unlabeled design.
library(DoE.base)
oa.design(nlevels = c(4,4,4,4,4,4,4,4,4,2,2))
Thank you for your help in advance.
