11 Final LMM: Summary

11.1 SPSS: Script

# Random intercept model

MIXED SBP BY Sex Group WITH SBP0 Age BMI Time 
  /CRITERIA = DFMETHOD(SATTERTHWAITE) CIN(95) MXITER(100) MXSTEP(10) 
    SCORING(1) SINGULAR(0.000000000001) HCONVERGE(0, ABSOLUTE) 
    LCONVERGE(0, ABSOLUTE) PCONVERGE(0.000001, ABSOLUTE) 
  /FIXED = Sex Group SBP0 Age BMI Time | SSTYPE(3) 
  /METHOD = REML 
  /PRINT = G R SOLUTION 
  /RANDOM = INTERCEPT | SUBJECT(ID) COVTYPE(VC) SOLUTION
  /EMMEANS = TABLES(OVERALL) 
  /EMMEANS = TABLES(Sex) 
  /EMMEANS = TABLES(Group) 
  /SAVE=FIXPRED SEFIXP PRED SEPRED RESID.  

11.2 SPSS Summary

11.3 ICC

We can calcualate the ICC using the estimates of \(\sigma^2_P\) and \(\sigma^2_e\) as:

\[ICC = \frac{5.8540}{5.8540 + 6.2872} = 0.4822\]

11.4 Interpretation of results

• Interpretation of the random effects

• Interpretation of the fixed effects

• Magnitude, direction and effect size of the fixed effects

• Interpretation of marginal means