A Model-Fitting Implementation of the DeFries-Fulker Model for Selected Twin Data

Author： Purcell S.  

Publisher： Springer Publishing Company

ISSN： 0001-8244

Source： Behavior Genetics, Vol.33, Iss.3, 2003-05, pp. : 271-278

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Abstract

In this research note, DeFries-Fulker (DF) regression analysis is reframed in model-fitting terms, where an individual's expected score is modeled as a function of their co-twin's proband status. This more flexible implementation of the DF model allows DZ-O twins to be incorporated in a sex-limitation model. Brief simulation results are presented along with the Mx scripts used.

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