Advertisement

Behavior Genetics

, Volume 33, Issue 3, pp 271–278 | Cite as

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

  • S. Purcell
  • P. C. Sham
Article

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.

Twins DeFries-Fulker analysis sex differences maximum likelihood estimation 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. DeFries, J. C., and Fulker, D. W. (1985). Multiple regression analysis of twin data. Behav. Genet. 15(5): 467-473.Google Scholar
  2. DeFries, J. C., and Fulker, D. W. (1988). Multiple regression analysis of twin data: Etiology of deviant scores versus individual differences. Acta Genet. Med. Gemellol. 37: 205-216.Google Scholar
  3. Kohler, H. P., and Rodgers, J. L. (2001). DF-analyses of heritability with double-entry twin data: Asymptotic standard errors and efficient estimation. Behav. Genet. 31(2): 179-191.Google Scholar
  4. Purcell, S., Eley, T. C., Dale, P. S., Oliver, B., Petrill, S. A., Price, T. S., Saudino, K. J., Simonoff, E., Stevenson, J., Taylor, E., and Plomin, R. (2001). Comorbidity between verbal and nonverbal cognitive delays in 2-year-olds: A bivariate twin analysis. Dev. Sci. 4: 195-208.Google Scholar

Copyright information

© Plenum Publishing Corporation 2003

Authors and Affiliations

  • S. Purcell
  • P. C. Sham

There are no affiliations available

Personalised recommendations