Hello all, I am using Qdec (version5.1) to study cortical thickness differences between groups having Age as nuisance covariate. I do not have assumption if the groups are different or not . Using DODS and DOSS gives me completely different results. We have three groups including 41, 39, and 24 subjects in each. My question is which results design matrix type is more reliable for such a study? And also what if I include a covariate of interest in my comparison?
Thanks in advance, Best regards, Amirhossein Manzouri
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