[R-sig-ME] lme error message
lborger at uoguelph.ca
Thu Jul 23 10:17:38 CEST 2009
> Singularity in backsolve at level 0, block 1
in fact my experience is that in this case there is some problem with the fixed effects (e.g. not enough data for all factor combinations etc.), otherwise it would say level 1 or higher. By fitting a simpler model usually it disappears.
Disclaimer: just limited empirical experience, I have never checked the code to understand better this error message, so take this with caution ;-)
----- Original Message -----
From: "Stuart Luppescu" <slu at ccsr.uchicago.edu>
To: "Ken Beath" <ken at kjbeath.com.au>
Cc: r-sig-mixed-models at r-project.org
Sent: Wednesday, July 22, 2009 12:22:56 AM GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna
Subject: Re: [R-sig-ME] lme error message
On 水, 2009-07-22 at 08:15 +1000, Ken Beath wrote:
> 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.
Random effects? Only the intercept is random, and in a more restricted
model there's tons of variance.
Stuart Luppescu -=- slu .at. ccsr.uchicago.edu
University of Chicago -=- CCSR
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