Dear FS expertsTrying to set up a Linear Mixed Effects, which I understand 
would basically be a repeated measures design. My design has 3 groups (HC, PT 
relatives and PT).Instead of time points  of the same subject my design matrix 
uses each family member within a family. So I will have many subjects within 
family_1, same for family_2 and so on...    I also want to include gender as a 
covariate. In short my question is:For my design in repeated measures do I need 
to define all my groups for each discrete variable as how we do it for glm?For 
example if I want to have variables GROUP + GENDER + FAMILY.Should i do it as 
follows?class HC_Female_Family1class PT_Female_Family1class 
HC_Male_Family2class HC_Female_Family2......
Many thanks,Pablo
                                          
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