I’m running a 3dANOVA3 with two groups (HVs & patients), with three resting state runs per participant (1,2,3) and looking for an effect over time/runs (presumably fatigue). It’s not clear to me from the AFNI help text what the difference is between type 4 and type 5 in the model, and what is meant by “C(A)” for type 5? Here’s the help text on the type option:

3dANOVA3

-type k type of ANOVA model to be used:

k = 1 A,B,C fixed; AxBxC

k = 2 A,B,C random; AxBxC

k = 3 A fixed; B,C random; AxBxC

k = 4 A,B fixed; C random; AxBxC

k = 5 A,B fixed; C random; AxB,BxC,C(A)

I’d appreciate any details and helpful references. Thanks.