Hi Andrew,

I have a design of 20 subjects in 3 different conditions and I did my design matrix according to your recommendations. Attached you can find the matrix, could you please confirm if this is the right way to do it? As a contrast I put [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] but I don't know what should a write as an exchange blocks. I am very new in this field so I am really struggling.

Thanks in advance for your help.