Dear fsl group,
I have got 4 EVs independent to each other: EV1, EV2, EV3, EV4. I want to test the linearity across them, thus the contrast would be [-1.5, -0.5 0.5 1.5]. Furthermore, I am also interested if cond1>cond2, cond2>cond3,cond3>cond4, how contrast would be? Can I use interaction contrast like [1 -2 0 1] deriving from (cond1-cond2)-(cond2-cond3)-(cond3-cond4)=cond1-2*cond2+cond4?
Best,
Joyce
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