Hello all,

I am interested in comparing the activation in two groups, who unintentional

differ from each other in performance. As a previous post, I would like to

answer the question "If these two groups did not differ by the covariate,

what would the activation look like?" The simplified model is as follows:

Group EV1(group1)  EV2 (group2) EV3 (performance)

1          1            0          3

1          1            0          1

1          1            0         -2.5

1          1            0          4

1          0            1         -1

1          0            1          2

1          0            1          1.7

1          0            1          1.5  

My two questions regarding this is:

1. Do I need to set up orthogonalisations? If so, how is this done correctly?

2. How would my contrasts look like if I am interested in answering the

question "How would group2 differ from group1 if all subjects had the same

performance?"

Hallvard Evensmoen