Closed-form approximations to the REML estimator of a variance ratio (or heritability) in a mixed linear model.


In this article, we estimate heritability or intraclass correlation in a mixed linear model having two sources of variation. In most applications, the commonly used restricted maximum likelihood (REML) estimator can only be obtained via an iterative approach. In some cases, the algorithm used to compute REML estimates may be slow or may even fail to… (More)


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