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Example 6
This completes the specification of Model A. 
EIn the Manage Models dialog box, click New.
EIn the Model Name text box, type Model B: Most General.
Model B has no constraints other than those in the path diagram, so you can proceed 
immediately to Model C. 
EClick New. 
EIn the Model Name text box, type Model C: Time-Invariance. 
EIn the Parameter Constraints box, type:
b_pow67 = b_pow71
var_a67 = var_a71
var_p67 = var_p71
For the sake of completeness, a fourth model (Model D) will be introduced, combining 
the single constraint of Model A with the three constraints of Model C. Model D can 
be specified without retyping the constraints. 
EClick New. 
EIn the Model Name text box, type Model D: A and C Combined.