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. Author manuscript; available in PMC: 2009 Mar 11.
Published in final edited form as: Circulation. 2008 Jun 30;118(3):247–257. doi: 10.1161/CIRCULATIONAHA.107.709105

Figure 3.

Figure 3

Elements of structural equation modeling in twin pairs for decomposition of trait determination. Boxes at the bottom represent measured variables in 2 twins within a twinship. Arrows represent causal pathways. Circles represent latent variables: the components of variance A (additive genetic variance), C (shared environmental variants), and E (unique, unshared environmental variance). Twin pair correlations are specified: genetic correlation (a), shared environmental correlation (c), and unique environmental correlation (e).