"Can i put two binary variables in the between factors part of the repeated measures ANOVA?"
Participants: Patients, Healthy Controls Task: All participants do a task (Pre intervention Score). Then they are randomised to either intervention or control. Then all the participants do the same task (Post intervention Score).
Data: 1) Pre intervention score VS Post intervention score (within as the same people do the task). The form of the score is a mean ranging from 1 to 6 in both cases. 2) Intervention group VS Control group (Binary variable) 3) Patients VS Healthy Controls (Binary variable)
I want to see whether the group that does the intervention ends up with a significantly higher difference (Pre Score, Post Score) compared to the group that does not, the control group. In other words, if the intervention ameliorates the performance in the task. Apart from this, I want to see whether the above applies to both patients and healhty controls or whether there is a differencec between them. Does the intervention work irrespective of the group (patient or healthy controls)? For example, if in the Healthy controls group the ones that did the intervention had a significantly higher difference compared to controls but in the patients group there was no difference between Intevention VS control, it would mean the intervention worked only for the healthy controls but not for the patients.
My thought was to use repeated measures ANOVA as the task is tested to the same people in different times (pre and post intervention). So, Pre Score and Post Score will be put in within factor. Can i use two in between factors? Intervention (binary: Intervention, Control), Participant Group (binary: Patients, Healthy Controls)
Is this possible or do i have to separate the file with select cases (pick only the patients) and include just the pre intervention VS post intervention as within and intervention VS control as between?
Furthermore, if the repeated measures ANOVA is possible, do i need to do a further test to see the differences between each group?