[R] bootstap and lme4

From: FabbroThomas <thomas.fabbro_at_unifr.ch>
Date: Mon 09 May 2005 - 22:54:02 EST


I am trying to get bootstrap confidence intervals on variance components and related statistics. To calculate the variance components I use the package lme4.

> off.fun <- function(data, i){
   d <- data[i,]
   lme1<- lmer(y ~ trt + (trt-1|group), d)    VarCorr(lme1)@reSumry$group[2,1] #just as an example
> off.boot <- boot(data=data.sim, statistic=off.fun, R=100)

If I choose small values of R (<10) then I get very reasonable results but for large R I get the following error massage:

Can anyone tell me why I get this error massage and what I can do to avoid this problem?

Thank you very much for your help!


I am working with:
R 2.1.0
boot 1.2-22

lme4 0.95-6
Matrix 0.95-7
lattice 0.11-6
latticeExtra 0.1-1

On Mac OS X 10.3.9

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