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Chapter 12
types of model may be expressed. Thus, the general non-linear constraints which are supported both by LISREL and EQS cannot be expressed in MB.
It should also be observed that the automatic assignment of scales to latent variables
causes some order dependency among MB statements. Thus, in a full structural equation
model the measurement models must be specified first, because otherwise the latent variables will be used as scaling variables.
To formulate models which are not supported by MB, the language may be used to specify
a model which is as close as possible to the intended one. After the instructions have been
generated, they may be edited into the final model.
Constructing the MB instructions
As has already been described the actual production of the MB statements is typically
done by STREAMS, and it has also been described how the user directs the process
through interaction with an intelligent editor and/or through drawing path diagrams. Here
more information is given about how to use the forms of the graphical user interface.
The Model form
When the Model button on the Modeling toolbar is clicked the Model form is presented:
The Model form has five tabs:
• Model Description
• Model Type
• Start Values
Structural Equation Modeling Made Simple