Nesting in a Mixed Model, Fixed or Random

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  • #3952
    S Battersby
    Member

    Hi all,

    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?


    I’m using SPSS 18.

    Many Thanks,
    S.

    #3953
    Jeremy Miles
    Participant

    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.

    Jeremy

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