I need some advice concerning a mixed model we are building:
1. within group comparsion of the angles at different time points
2 beteen group comparsons of the angles at different time points
I want to measure in 2 different groups: 5 different spinal angles at 30 fixed time points
What can be random effects? participants (group), age, gender, lifestyle (ordinal), socio-economic status (ordinal),
Fixed effects? time points and angles
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It seems to me that age, gender, lifestyle (ordinal), and socio-economic status (ordinal) would be fixed effects.
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