I know mixed ANOVA should be used when testing a data set containing within-between subjects design. As my data structure shows below, my between-subjects factor is
Age group, each group takes
Pill A and
Placebo at different time points (within-subjects). But the tricky thing is that within
Placebo, there is a between-subjects factor by
placebo size; some people take
Large Placebo, others take
Small Placebo. How can I count this in my mixed ANOVA analysis?
The effect I intend to test is the
Age x Pill interaction effect. My ultimate question is how different age groups react differently to
Also, what is the equivalent OLS for this mixed ANOVA? Hierarchical Linear Model?