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Modified twin-correlation model. GA1 = twin 1 general ability score; GA2 = twin 2 general ability score; z1 = twin 1 latent GA score; z2 = twin 2 latent GA score; EDU = mid-parent education level; S = random effect of latent GA on observed GA in standard deviation units; rMZ/rDZ = MZ and DZ twin GA correlations, respectively, moderated by mid-parent education level.
