 DeFries–Fulker regression

DeFries–Fulker regression is a statistical method used primarily in the field of behavioral genetics to analyze the relationship between a trait (such as IQ, height, or other measurable characteristics) and genetic factors. Specifically, it is often employed to assess the additive genetic and environmental contributions to the variation in traits observed in populations. The technique is named after researchers Robert DeFries and David Fulker, who developed it to analyze data from twin studies.