Dear colleges,
I have a flexible factorial design with Factor A (2 levels) and Factor B (4 levels). I have modeled only the interaction terms (which mean that the design matrix columns are: A1B1, A1B2, A1B3, A1B4, A2B1, A2B2, A2B3, A2B4, subjects....).
Which will be the contrast vector to study the main effect of FactorB ?
The F-contrast : -2 -1 1 2 -2 -1 1 2 zeros(1,# of subjects) is good or not ?
Thank you very much
Michaƫl
|