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2. Admixture model

Individuals may have mixed ancestry. This is modelled by saying that individual $ i$ has inherited some fraction of his/her genome from ancestors in population $ k$. The output records the posterior mean estimates of these proportions. Conditional on the ancestry vector, $ q^{(i)}$, the origin of each allele is independent. We recommend this model as a starting point for most analyses. It is a reasonably flexible model for dealing with many of the complexities of real populations. Admixture is a common feature of real data, and you probably won't find it if you use the no-admixture model. The admixture model can also deal with hybrid zones in a natural way.

William Wen 2002-07-18