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.
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@ 0.577 y2@0.577  y3@0.577;
  linear by y1@-0.707 y2@0      y3@0.707;
  quad   by y1@ 0.408 y2@-0.816 y3@0.408;
  [int linear quad];
  [y1-y3@0];
  y1-y3@0;
  int linear with quad;
  int with linear;