Recently I've been using the twin data from the Chinese National Twin Registry(CNTR) to calculate the heritability of BMI, WC and waist-height ratio. Differently, the data includes both twins reared apart and together in order to obtain the ADCE model. So there are four types of twins in my data: monozygotic twins reared apart(MZA), monozygotic twins reared together(MZT), dizygotic twins reared apart(DZA), dizygotic twins reared together(DZT). However, the scripts I've found are all about ADE or ACE, does anyone has the experience to handle this kind of data or is there any resource on the Internet talking about this method.
Thanks in advance!