title:
  Data from page 166 in EQS program.
  Input based on Appendix 6.3 page 166, but is only
    for group 4 (the true longitudinal group).
  Figure 6.1 page 77, group 4 only.
  Output. 

    Table 6.4 (true longitudinal), page 81.
    NOTE. Correlation is standardized value of
      int with slope.

    Also Table 6.5 (true longitudinal column), computed
    based on intercept and slope values
data:  
  file = ch6tl.dat;
  format = free;
  type = means covariance;
  nobservations = 215;
variable:  
  names = y1 y2 y3 y4 y5; 
analysis:  
  type = general meanstructure;          
model:
  int by y1@1 y2@1 y3@1 y4@1 y5@1 ;
  slp by y1@0 y2@1 y3 y4 y5 ; ! estimate time scores for 3-5
  [int]; ! estimate mean of intercept factor
  [slp]; ! estimate mean of slope factor
  [y1@0 y2@0 y3@0 y4@0 y5@0]; ! set intercepts of indicators to 0
output:
  standardized tech1;