Displaying 2 results from an estimated 2 matches for "pettay".
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petta
2006 Jan 31
1
Mixed-effects models / heterogeneous covariances
Dear R-list,
maybe someone can help me with the following mixed-effects models
problem, as I am unable to figure it out with the 'nlme-bible'.
I would like to fit (in R, obviously) a so-called animal model (google
e. g. "Heritability and genetic constraints of life-history" by Pettay
et al.) to estimate the variance component that is due to genetic
effects. The covariances of the genetic random effects between
observations are given by the different degrees of relatedness between
the individuals examined. (I find it difficult to explain, but Pettay
et al. describe it nicely in...
2006 Feb 03
0
Mixed-effects models / heterogenous covariances
...be someone can help me with the following mixed-effects models
> problem, as I am unable to figure it out with the 'nlme-bible'.
>
> I would like to fit (in R, obviously) a so-called animal model (google
> e. g. "Heritability and genetic constraints of life-history" by Pettay
> et al.) to estimate the variance component that is due to genetic
> effects. The covariances of the genetic random effects between
> observations are given by the different degrees of relatedness between
> the individuals examined. (I find it difficult to explain, but Pettay
> et a...