title:
  Data from table 2.1, page 20.
  Input 3.2 page 36.
  Figure 3.1 page 36.
  Output page 37 and table 3.4 and 3.5.
  ** NOTE ** Output does not match because 
    used 0 1 2 for time values.
  ** NOTE ** Manually specifying growth model.
data:  
  file is ch2.dat;
  format is free;
  type is correlation means stdeviations;
  nobservations = 343;
variable:  
  names are y1 y2 y3; 
  usevar =  y1-y3;
analysis:
  type = general meanstructure;          
model: 
  int    by y1@1 y2@1 y3@1;
  linear by y1@0 y2@1 y3@2;
  quad   by y1@0 y2@1 y3@4;
  [int linear quad];
  [y1-y3@0];
  y1-y3@0;
  int linear with quad;
  int with linear;