Re: SPSS Syntax MIXED Model

Posted by Alex Reutter on
URL: http://spssx-discussion.165.s1.nabble.com/SPSS-Syntax-MIXED-Model-tp5713934p5713965.html

Model 11 will not estimate a random slope, as stated as desired in the original post, while Model 5 will.  I think there can be good reasons for fitting the data either way, but you need to decide what you're trying to estimate.  

I also just realized that Time_point is your index for repeated measurements and not Age, and so would amend the random coefficients model to be:

MIXED
 Blood_test_Value BY Gender Ethnicity WITH Age Time_point
 /FIXED = Gender Ethnicity Age Time_point | SSTYPE(3)
 /METHOD = REML
 /RANDOM INTERCEPT Time_point | SUBJECT(id) COVTYPE(UNR) .

Alex