Typically, c influences i and s, not the other way around. The c influence on i and s is such that i and s have different means across the classes. You will have this model as the default if you say only
i s | etc
in the overall part of the model.
If in contrast you really intend to have c influence i and s, you should have observed indicators of c. And you should also specify the model so that the means of i and s do not vary across the classes - if not, you have a reciprocal interaction loop problem where c influences i and s and i and s influence c.
Diane Chen posted on Monday, November 22, 2010 - 7:57 am