Hi Anderson,
Thanks for the quick reply!
In our design, we consider subjects as a random effect and condition as fixed. We fixed the conditions before the experiment, and we're interested in the difference between our fixed levels of pre to post for condition A vs. condition B (i.e., is the pre-to-post change for condition A significantly different than the pre-to-post change for condition B?). And then whether or not that interaction is different for the 2 age groups.
How would this change the design that you had sketched where condition was considered as a random effect?
Many thanks!
Tim
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