Hi all,
I'm new to OpenMx and SEM, and I have just read through the various examples on twin modelling. Just wondering, if I have a moderator variable which varies within twin 1 and twin 2 and also across twin pairs, how do I go about specifying it as a definition variable? Or do I have to do bivariate analysis instead (treating the moderator variable as another variable?)
Thank you very much!
Cheers,
Yi