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. Author manuscript; available in PMC: 2009 Dec 1.
Published in final edited form as: J Pers. 2008 Dec;76(6):1485–1521. doi: 10.1111/j.1467-6494.2008.00529.x

Figure 1.

Figure 1

Standard model for the etiology of individual differences in a single observable characteristic measured in twin pairs. A= additive genetic variance, C=shared environmental variance, E=nonshared environmental variance.