Dear Expert
So here are 2 groups of people, and I'd like to address the different variances within each group by giving them different group variables.
EV3 and EV4 are ages (demeaned within all participants)
Group Variable EV1 EV2 EV3 EV4
1 1 0 20 0
1 1 0 30 0
2 0 1 0 30
2 0 1 0 40
Contrasts:
group difference 1 -1 0 0 and -1 1 0 0
group x age interaction 0 0 1 -1 and 0 0 -1 1
Hope it's correct?
Also, is it true that once group x age interaction is found, the group difference result (if there is any) will be meaningless?
Thanks so much!
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