MIXED
  IMPS79  WITH Drug Sweek DrugSwk DropW DropWDrug DropWSweek DropWDrugSwk
  /FIXED = Drug Sweek DrugSwk DropW DropWDrug DropWSweek DropWDrugSwk  
  /METHOD = ML
  /PRINT = SOLUTION TESTCOV
 /RANDOM INTERCEPT Sweek  | SUBJECT(ID) COVTYPE(UN) .