Use of SAS PROC MIXED to Analyze Biorhythms

Primer

Simulated dataset

Generating the data

1. Simulated dataset (id,age,sex,rx,time,attribute)
2. S-Plus program to create simulated dataset
3. Graph of simulated raw data
4. Graph of typical curve showing effects of 1/24 and 1/8 hour frequencies

Summary of results

Detailed Analysis Steps

• Step 1 : Check need for AR error structure
  SAS procedure file   SAS list file   SAS log file

• Step 2a : Work on random intercept model selection
  SAS procedure file   SAS list file   SAS log file

• Step 2b : Work on random slope model selection
  SAS procedure file   SAS list file   SAS log file

• Step 2c : Work on random effects correlations model selection
  SAS procedure file   SAS list file   SAS log file

• Step 3a : Work on fixed effects interactions model selection
  SAS procedure file   SAS list file   SAS log file

• Step 3b : Work on fixed effects harmonics model selection
  SAS procedure file   SAS list file   SAS log file

• Step 3c : Work on fixed effects cofactors model selection
  SAS procedure file   SAS list file   SAS log file

• Final Model
  Summary of final model   SAS procedure file   SAS list file   SAS log file   Splus file mentioned in SimFinal.txt   Plot from SimConvert.q