[R-sig-ME] lme error message

[Ken Beath]

On 22/07/2009, at 7:54 AM, Stuart Luppescu wrote:

> Running a nested model with lme, and getting this message:
>
> Error in MEEM(object, conLin, control$niterEM) :
>  Singularity in backsolve at level 0, block 1
>
> Can anyone explain this?
>

Usually means that some of the random effects are highly correlated or  
possibly zero.

Ken



> Thanks.
> -- 
> Stuart Luppescu -=- slu .at. ccsr.uchicago.edu
> University of Chicago -=- CCSR
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