An ADE model is a genetic model for twin studies which includes dominance genetic effects.. Biometrical

Biometrics

Biometrics As Jain & Ross point out, "the term biometric authentication is perhaps more appropriate than biometrics since the latter has been historically used in the field of statistics to refer to the analysis of biological data [36]" . consists of methods...

 genetic modeling of twin or other family data can be used to decompose the variance of an observed response or phenotype

Phenotype

A phenotype is an organism's observable characteristics or traits: such as its morphology, development, biochemical or physiological properties, behavior, and products of behavior...

 into genetic

Genetics

Genetics , a discipline of biology, is the science of genes, heredity, and variation in living organisms....

 and environmental

Environment (biophysical)

The biophysical environment is the combined modeling of the physical environment and the biological life forms within the environment, and includes all variables, parameters as well as conditions and modes inside the Earth's biosphere. The biophysical environment can be divided into two categories:...

 components. Convenient parametrization

Parametrization

Parametrization is the process of deciding and defining the parameters necessary for a complete or relevant specification of a model or geometric object....

s requiring few random effects allow such models to be estimated using widely available software for linear mixed models (continuous phenotypes) or generalized linear mixed model

Generalized linear mixed model

In statistics, a generalized linear mixed model is a particular type of mixed model. It is an extension to the generalized linear model in which the linear predictor contains random effects in addition to the usual fixed effects...

s (categorical phenotypes).

A stands for additive genetic effects

Additive genetic effects

The additive genetic effect is an estimate of the quantitative change in a trait that is associated with substituting one allele with that of another allele within an interbreeding population. Additive effects are often calculated by genotyping and phenotyping offspring of a genetic test cross...

, D for non-additive genetic (or dominance) effects, and E for nonshared environment effects.