Extending the package

As discussed in the section on Model Construction, every Structural Equation Model (Sem) consists of four parts:

On the following pages, we will explain how you can define your own custom parts and "plug them in". There are certain things you have to do to define custom parts and some things you can do to have a more pleasent experience. In general, these requirements fall into the categories

• minimal (to use your custom part and fit a Sem with it)
• use the outer constructor to build a model in a more convenient way
• use additional functionality like standard errors, fit measures, etc.