lme error message
Hello,
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 ;-) HTH Cheers, Luca ----- 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 ?, 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 ???????? -=- Kernel 2.6.28-gentoo-r5 Oz: Sometimes when I'm sitting in class...you know, I'm not thinking about class 'cause that would never happen... I think about kissing you. And it's like everything stops, it's like, freeze frame: Willow kissage. _______________________________________________ R-sig-mixed-models at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-sig-mixed-models