Specifying a Model

After you've drawn an initial model structure, you have to define your variables and their relationships. This is known as "Specifying a Model". There are three items to specify:

You can fill in the values for the stock and the constant using the "Specify Variables" window. To open this window double click on the constant or stock you want to specify.

Defining an auxiliary is a bit more complicated. Follow the steps below:

The model changes as follows (note the question mark):

Double click the question marks in your model to open the "Specify Variables" window again, and select the appropriate qualitative relationship from the drop down list.

The meaning of these relationships are explained in the Types of Variables and Relationships helpfile.