To summarize therefore, the additive genetic factor A is twice the difference between MZ and DZ twin correlations (this is known as Falconer's formula), C is the MZ twin correlation minus this estimate of A, and the random (unique) factor E is (1 - rmz), i.e. MZ twins differ due to unique environments only (Jinks & Fulker, 1970; Plomin, DeFries, McClearn, & McGuffin, 2001).
To summarize therefore the additive genetic factor A is twice the difference between MZ and DZ twin correlations (this is known as Falconer's formula) C is the MZ twin correlation minus this estimate of A and the random (unique) factor E is (1 - rmz) ie MZ twins differ due to unique environments only (Jinks & Fulker 1970; Plomin DeFries McClearn & McGuffin 2001)