Genetic model

Additive and dominance terms only: V^{DZ}_{g} = 1/2V_{A}+1/4V_{D}

Variable: V^{DZ}_{g} = p^{DZ}_{g}V_{g} with 0 < = p^{DZ}_{g} < = 1/2

Shared twin environments

Equal environments assumption: c_{MD} = 1

Variable: 1 < = c_{MD} < = R_{MD} c_{MD} = R_{MD} implies V_{g} = 0

Shared sibling environments

Siblings not included.

Variable: 0 < = c_{SD} < = R_{SD} Familial aggregation may be due to genes (c_{SD} = 0) or environment (c_{SD} = R_{SD}).

Geneenvironment interactions

None

Variable: V_{ge} = f^{2}_{ge}· V_{g}· V_{e}/r^{2}_{t} ε/(1ε)PAF_{e} < = f_{ge} < = 1/PAF_{e}

Geneenvironment correlations

None

None

Method

Total phenoptypic variance given by: V_{P} = V_{g}+V_{e} V_{P} is input and a single solution for V_{e} and V_{g} calculated. Heritabilities are given by: H^{2} = V_{g}/V_{P} h^{2} = V_{A}/V_{P}

V_{e} and ε are input and V_{g} and V_{ge} calculated, for a chosen c_{MD} and all possible values of f_{ge} and p^{DZ}_{g}. Method is not valid if R_{SD} = 1.
