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The Use of Linear Mixed Models to Estimate Variance Components from Data on Twin Pairs by Maximum Likelihood

Published online by Cambridge University Press:  21 February 2012

Peter M. Visscher*
Affiliation:
Institute of Evolutionary Biology, School of Biological Sciences, University of Edinburgh, Scotland, United Kingdom. [email protected]
Beben Benyamin
Affiliation:
Institute of Evolutionary Biology, School of Biological Sciences, University of Edinburgh, Scotland, United Kingdom.
Ian White
Affiliation:
Institute of Evolutionary Biology, School of Biological Sciences, University of Edinburgh, Scotland, United Kingdom.
*
*Address for correspondence: Peter M. Visscher, School of Biological Sciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, Scotland, UK.

Abstract

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It is shown that maximum likelihood estimation of variance components from twin data can be parameterized in the framework of linear mixed models. Standard statistical packages can be used to analyze univariate or multivariate data for simple models such as the ACE and CE models. Furthermore, specialized variance component estimation software that can handle pedigree data and user-defined covariance structures can be used to analyze multivariate data for simple and complex models, including those where dominance and/or QTL effects are fitted. The linear mixed model framework is particularly useful for analyzing multiple traits in extended (twin) families with a large number of random effects.

Type
Articles
Copyright
Copyright © Cambridge University Press 2004