Hi,
I’m an undergrad, currently in my 3rd year doing my dissertation.
I have 2 groups (time and method), and all participants are in both groups, so it’s a 2-way repeated measures ANOVA.
The time variable has 4 levels (5, 10, 15 and 20 mins), and the method variable has 2 levels (A and B).
I am only wanting to compare A and B at each time point, but after doing the RM ANOVA on SPSS, I don’t know which follow up tests to use. I know that if I do post-hocs, then it compares everything, and therefore decreases the chance of getting significant results. I’ve also had a look at standard contrasts, but I can’t see one which would suit my situation.
To make things easier, I want to compare the following:-
(1,1) vs (2,1)
(1,2) vs (2,2)
(1,3) vs (2,3)
(1,4) vs (2,4)
with the first number representing the method, and the second number the time.
Thank you for any replies.
Graham