I am writing a report on a 2 x 3 mixed study. There is ONE within IV with TWO levels and there is ONE between subjects IV THREE levels. There are two DVs.
Sample sizes for each group is 25, 25, 27.
I tried Mauchly's test but it does not produce any results. I read somewhere that you can only use that for studies with 3 or more within IVs.
So my question is do I use the Box's test and refer to the Greenhouse Geisser output?