Dear experts,
This has been discussed before somewhat, so I'm sorry for asking yet again. I just wanted to make sure that I am using the correct design matrix for my group analysis. It's a 2 group (18 and 19 subjects) x 2 timepoints design. I'm getting confused on whether I have to model the mean for each group across time points.
The design without the means is attached. With the means it would look something like the one below.
Thank you in advance.
-Marina
EV1 EV2 EV3 EV4 Individual means.....
Group1 Group2 t1-t2GR1 t1-t2GR2
1 0 1 0
1 0 1 0
.... .... .... ....
1 0 -1 0
1 0 -1 0
.... .... .... ....
0 1 0 1
0 1 0 1
.... .... .... ....
0 1 0 -1
0 1 0 -1
.... .... .... ....
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