Dear FreeSurfer experts,

I want to test linear, square and cubic effects of age on different parameters (thickness, lGI....) with qdec.

I add age (square) and age (cubic) as column in my qdec table.

Am i right to see only the square effects:
Add Age square as continous factor and age (maybe age cubic too?) as nuisance factor in the model.

Best wishes and thanks a lot.

Daniel