Hello all,
I am stuck on making the model for a 2x2 repeated measure ANOVA with a covariate. It will be great if someone could help me with it!
Our study design is: two groups of people, go through either Purple or Control intervention (between-subject); everyone has two scans, pre and post intervention (within-subject). Now, we have seen that subjects' rating scores are negatively correlated with insula activation in pre-post contrast in the Purple group. Meaning if they rate higher on grating, they would experience a smaller decrease in insula. Now, we want to compare this effect between Purple and Control group. The score is only collected once.
Assuming we have 4 people, 2 purple 2 control, and they have scores as purple1=5, purple2=2, control1=4, control2=3
ev1 ev2 ev3 ev4 ev5 ev6 ev7
P1 pre 1 1 5
P2 pre 1 1 2
P1 post -1 1 -5
P2 post -1 1 -2
C1 pre 1 1 -4
C2 pre 1 1 -3
C1 post -1 1 4
C2 post -1 1 3
and contrast be ev7=1?
or should I have ev7 as 5, 2, -5, -2, 4, 3, -4, -3 and have the contrast as ev1=1, ev2=-1, ev7=1?
Sincerely,
Ting
