Appendix.
Expected transformed1 co-twin and co-sib means and parameter estimates
| Expectations and parameter estimates | |
|---|---|
| Transformed means | |
| MZ Co-twin mean (CMZ) | h2g + c2g(t) = .9190 |
| DZ Co-twin mean (CDZ) | ½h2g + c2g(t) = .5856 |
| Co-sib mean (CS) | ½ h2g + c2g(s) = .5039 |
| h2g = 2(CMZ−CDZ) = 2(.9190 − .5856) = .6668 | |
| Differential c2g | |
| c2g(MZ) | (CMZ− h2g) = (.9190 − .6668) = .2522 |
| c2g(DZ) | (CDZ − ½ h2g) = (.5856 − .3334) = .2522 |
| c2g(s) | (CS − ½ h2g) = (.5039 − .3334) = .1705 |
| B3 | c2g (t) − c2g (s) = (.2522 − .1705) = .0817 |