Hi Gina,
Just to add to this, if you are set on using the Flexible Factorial module, don't use the Glacher & Gittelman guidance as it gives unsuitable advice for forming tests in these models. You can read about this here: https://www.frontiersin.org/articles/10.3389/fnins.2019.00352/full
It's also worth saying that even in traditional mixed-effects approaches to repeated measures, you always model the subjects as having the same population variance (they are a single variance component/random effect) and so that is the approach you should take here, as Guillaume says.
Best wishes,
Martyn
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