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Table 1 The general form of covariance matrices for the G × discrete E parameterization

From: A comparison of discrete versus continuous environment in a variance components-based linkage analysis of the COGA data

Subject i smokes Subject j smokes Covariance Matrix
1 1 Ω = 2 Φ σ2xg + I σ2xe
0 0 Ω = 2 Φ σ2yg + I σ2ye
1 0 Ω = 2 Φ σxg σyg ρg + I σxe σye