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English: Gene parameter estimation from 10 optimal models of DSMIV personality disorder. Since the path estimate is a standardized regression coefficient, it must be squared to match the ratio of variance described by the dependent variable. Abbreviation for additive genetic effect. Indexes C and S represent common factors and disability-specific effects, respectively. The first, second, and third genetic similarities are identified by indexes C1, C2, and C3'. Pathways with a score of +0.28 or higher (accounting for 8% or higher of the phenotypic variance) are the first, second, and third common factors in red, green, and blue, respectively, and are color-coded by disorder-specific factors in magenta. Paths that do not exceed the +0.28 limit are grayed out. From reference 52: Kendler KS, Aggen SH, Czajkowski N, et al. Structure of genetic and environmental risk factors for DSMIV personality disorder, a multivariate twin study.