I’m using a Mixed Model at the moment and I have a question regarding a factor and if it should be fixed or random.
It makes use of two factors: Condition (Fixed) and Group (Random). I want to include Condition x Group. Now, does this mean that this nested factor becomes a Random factor because of Group, or is it still Fixed because of Condition?
Random and fixed are very curious terms that mean different things in different contexts. (For example, if you want to run what an economist calls a fixed-effects regression, you need to put a random factor into a mixed model. But if you want to run a random effects regression, you can use regression, or mixed model with no random factors).
Tell us more about your design.
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