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I just wanted to ask something about the SPSS problem i am trying to solve.
I have repeated measures of a blood test for each patient (2-15 measurements per patient) and i want to find out the effect of each independent variables such as age, gender and ethnicity on the decline of this blood test over time. Therefore i am trying to run a random intercept and random slope models on repeated measurements by using MIXED model procedure in SPSS. However, the program is giving me an error of saying that there is insufficient memory to estimate model parameters. Totally i have 135823 cases of rows. When i tried to run in a smaller size of cases, the code did worked. What can i do to solve my problem ? Is it a problem due to computer memory or SPSS memory ? How can i make the code work ?
My code is something like;
MIXED Blood_test_Value BY Gender Ethnicity WITH Age
/CRITERIA=CIN(95) MXITER(100) MXSTEP(5) SCORING(1) SINGULAR(0.000000000001) HCONVERGE(0,
ABSOLUTE) LCONVERGE(0, ABSOLUTE) PCONVERGE(0.000001, ABSOLUTE)
/FIXED=Gender Ethnicity Age | SSTYPE(3)
/METHOD=ML
/PRINT=G SOLUTION TESTCOV
/RANDOM= INTERCEPT | SUBJECT(ID) COVTYPE(ID)
/REPEATED= Time_point | SUBJECT(ID) COVTYPE(UNR).
Thank you.
Zalihe.
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