External Email - Use Caution Dear Sir/Madam,
Could I post the following message to the mailing list: I am running a regression testing for significant difference in cortical volume, thickness etc with 3 factors: diagnosis, genotype and gender, with age as a nuisance factor. I am using qdec but receiving Error: factor 2 must have 2 levels. Is it true that Qdec only supports factors with 2 levels? There is a page for qdec levels stating to create a file diagnosis.levels and state the three levels. I did this however the same error occurs. I was going to use glm_fit instead but I think my study isn't a linear regression so isn't suitable (as I am not interested in the change with age, just between groups). Kind regards, Marie
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