GET FILE='assignment_data_tran.sav'.


/* unconditional linear growth mdodel

MIXED
  data  WITH ctime
  /FIXED = ctime
  /RANDOM = INTERCEPT ctime  | subject(s) COVTYPE(ID) 
  /PRINT SOLUTION 
  /SAVE = FIXPRED PRED RESID .

/* linear growth model with a person-level covariate 

MIXED
  data WITH a ctime
  /FIXED = a ctime a*ctime 
  /RANDOM = INTERCEPT ctime  | SUBJSET(s) COVTYPE(ID) 
  /PRINT SOLUTION 
  /SAVE = FIXPRED PRED RESID .