Problem: Larsen and Buss present a simple formula for calculating heritability. One simply takes two times the difference between the correlation ("r") on some trait for monozygotic (MZ) or identical twins and the correlation on that same trait for dizygotic (DZ) or fraternal twins. Here is the formula:
Heritability = 2 (rmz - rdz)
Calculate the heritability for the following
rmz = .90, rdz = .10
rmz = .60, rdz = .40
rmz = .30, rdz = .30