Dear SPM experts,
I have a question regarding how to model unbalanced factors in second level.
In experiment, there are three variables: group (normal vs. patient), treatment (A vs. B) and level (1-4). The problem is that only the normal group went through both treatment A (level1-4) and B (level1-4) while the patient group went through treatment A. How can I model all these data in one design matrix at the second level?
Any suggestion is appreciated! Thanks!
Sincerely,
Veda
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