[R-sig-ME] confidence intervals of VPC

Julien Martin julien.martin2 at usherbrooke.ca
Sun Apr 18 00:01:43 CEST 2010

when using a model mixed with both a random intercept and slope such as 
lmer( y ~ x + ( x | group) )
we could computed the variance partition coefficient (VPC) as suggested 
by Goldstein et al 2002.
VPC_x = (Vi + X*cov(I,S) + X^2 * Vs) / (Vi + X * cov(I,S) + X^2 * Vs + Vr)
I am wondering how we could obtain confidence intervals for VPC using lmer.

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