I used sas mixed procedure, but if I change the reference group, the result wont consistent with each other.
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https://dl.dropboxusercontent.com/u/58818440/1.pdf
I just changed the reference group tm=after to tm= before, but the mean value for each group are not equal. Eg. for “A-before ”, in table 1, 4136.75+226.43-225.96-244.39=3892.83, but in table 2, 3744.63+59.1572=3803.78. They are not equal.
sas code:
PROC MIXED DATA= use method=ml order=data ;
class study_id identifier tm ;
MODEL allowp = identifier tm identifier*tm/ solution ;
REPEATED / subject=study_id type=un rcorr;
run;
https://dl.dropboxusercontent.com/u/58818440/1.pdf
I just changed the reference group tm=after to tm= before, but the mean value for each group are not equal. Eg. for “A-before ”, in table 1, 4136.75+226.43-225.96-244.39=3892.83, but in table 2, 3744.63+59.1572=3803.78. They are not equal.
sas code:
PROC MIXED DATA= use method=ml order=data ;
class study_id identifier tm ;
MODEL allowp = identifier tm identifier*tm/ solution ;
REPEATED / subject=study_id type=un rcorr;
run;