Dear Expert:
If I want to examine whether there are any differences in the slopes of FA with Age among three groups, would the following matrix and contrasts work for me? (As an example below, 3 subjects per group, and the age will be demeaned)
EV1 EV2 EV3 EV4 EV5 EV6
G1 G2 G3 AgeG1 AgeG2 AgeG3
1 0 0 20 0 0
1 0 0 18 0 0
1 0 0 16 0 0
0 1 0 0 12 0
0 1 0 0 15 0
0 1 0 0 19 0
0 0 1 0 0 21
0 0 1 0 0 17
0 0 1 0 0 14
Contrasts: EV1 EV2 EV3 EV4 EV5 EV6
C1: SlopeG1 > SlopeG2 0 0 0 1 -1 0
C2: SlopeG1 < SlopeG2 0 0 0 -1 1 0
C3: SlopeG2 > SlopeG3 0 0 0 0 1 -1
C4: SlopeG2 < SlopeG3 0 0 0 0 -1 1
C5: SlopeG1 > SlopeG3 0 0 0 1 0 -1
C6: SlopeG1 < SlopeG3 0 0 0 -1 0 1
Thank you very much,
Yuwen
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