Hi, I have continuous data for 8 subjects and around 4-5 data for each subject. I would like to see the correlation between the dependent variable and the independent variable. But first, I want to see if I can mix the data together without taking into account that there is 8 subjects. In fact, I want to see if samples taken from the same donor are as independent as the samples taken from different donors. Therefore, I have to justify mixing all samples together which would ease my analysis. Can anyone tell me if it is correct: To justify mixing all samples together, I have to see if the variance within-subject is less than the variance between-subject? Or is it the contrary? To do that, I used the donor as a random effect in Mixed models procedure and I compare the within-subject effect (residual variance) to the between-subject effect (donor variance). Thank you very much! ... View more