I am quietly new to Openmx and thankful for any help that I can get.
I have repeated measurement of continuous variable over two time periods to which I would to do similar analysis as in the De Geus et al (2007) : Bivariate Genetic Modeling of Cardiovascular Stress Reactivity: Does Stress Uncover Genetic Variance?.
I am starting from the script (http://www.vipbg.vcu.edu/vipbg/HGEN619/BivTwinMaRawCon.R ) of bivariate cholesky by Hermine Maes. What I would to do is to add a test of genetic amplification (a11=a21?) as well as whether there is a new gene that comes into play later stage in life (a22=0?).
Thankful for any help to formulate this new addition to the model!