R help - Dec 2006 - Obtaining Estimates of the Random Effects Parameters

I'm running simulation using lme and sometimes the estimated
variance-covariance matrix is not positive definite so that the
intervals function won't work for the random effect coefficients. I've
tried varcomp from the ape package but this does not return all the
coefficients. How can I extract the random effect coefficients without
using intervals?

Rick B.

?VarCorr 
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Rick Bilonick
> Sent: Wednesday, December 13, 2006 11:40 AM
> To: R Help
> Subject: [R] Obtaining Estimates of the Random Effects Parameters
> 
> I'm running simulation using lme and sometimes the estimated 
> variance-covariance matrix is not positive definite so that 
> the intervals function won't work for the random effect 
> coefficients. I've tried varcomp from the ape package but 
> this does not return all the coefficients. How can I extract 
> the random effect coefficients without using intervals?
> 
> Rick B.
> 
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