Hey, Donald,
Thanks for your kind reply.
In my study, we collected three groups with 3 age columns. According to the precondition for ANCOVA degisn, I think we should firstt need to assess the slope differences as you mentioned. But I have no idea how to conduct this step using SPM, could you render some introduction on that since I'm just starting to do data analysis.
In addition, if slopes turn out different between three 3 groups, what should I handle that? Dose it mean that ANCOVA model is not doable or any other method we should take?
Regards,
Carmen
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