I need to compare three groups of five subjects each (between-subjects design) where a variable is measured between time 0 and time 1. The interest of the study is on relative or raw difference.
I wonder whether I should use repeated measures ANOVA or one-way ANOVA. My guess is that I am removing any within subject variation because my research interest is in the difference between time 0 and time 1 and not in absolute value. So a one-way approach would be right. I wonder whether my reasoning is flawed anywere?
The same reasoning could be applied on paired vs. one sample t-test when the interest is on differences.