title:
  Data from table 3.1, page 39.
  Input 3.6 page 43.
  Output top page 44 and output 3.10.
  ** NOTE ** Output does not match book because 
    used 0 1 2 for time values.
data:  
  file is ch3.dat;
  format is free;
  type is correlation means stdeviations;
  nobservations = 343;
variable:  
  names are v1 v2 v3 age prob; 
  usevar =  v1 v2 v3 prob;
analysis:  
  type = general meanstructure;          
model: 
  int lin quad | v1@0 v2@1 v3@2;
  [v1-v3@0];
  v1-v3@0;
  prob on int lin quad;