I am running a statistical analysis for an experiment where subjects were randomly selected. A strength measurement was taken at the same two locations (location) for each participant. The strength measurement was taken twice with two different methods (method). So there are 4 measurements for each participant. We would like to determine if gender impacts the strength. To do this we ran the following model: proc mixed data=set; class IDnum Sex method location; model strength = Sex | method | location; random IDnum(Sex); run; The nested effect (IDnum(sex)) is considered to be random. But does this take into account the variability due to individuals themselves? Would I need to modify the random statement as follows: random IDnum(Sex) IDnum;
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