Hi!
I am trying to do a covariate analysis to control for differences that may
exist between two groups. I have looked at earlier messages in the list,
but there was still one thing that was unclear - what does the contrast
look like?
I have my higher level model set up in the following manner. I have two
groups (each with 12 subjects), so I used 2 EVs to capture these groups,
and then set my 3rd EV to age, demeaning it.
Group EV1 EV2 EV3(age)
1 1 0 3
1 1 0 1
1 1 0 0
1 1 0 -1
1 1 0 -3
1 0 1 -1
1 0 1 -.5
1 0 1 0
1 0 1 .5
1 0 1 1
If I wanted to know just the group differences, my contrast would look
like -1 +1 0, right? If I wanted to look at group differences, controlling
for age, what is the contrast?
Thanks,
Eric
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