I've attached a script with a saturated model for a categorical (3 categories 0,1 and 2). Now I am wondering how to know if I have to control for sex/age in my next analysis (ACE/ADEmodel). I guess I would have to add sex(i also have opposite sex pairs) and age(continous) to the saturated model and see if it makes a significant difference of fit if i drop them or constraint them to be equal.However, I have no idea how to get these variables in this saturated model. Do any of you have any tips where to find this or how to get started?
ps: Sorry if this al sounds like nonsense, as a student I am very new to the topic of twin analysis and the programm OpenMX (so also never used the old MX).