[R] lme problem ?

Troels Ring tring at mail1.stofanet.dk
Wed Jun 2 21:56:19 CEST 1999

Dear friends. I tried the session below with 10 MB in both vsize and nsize but didn't get the
example work. Is this a problem in LME or in me or both or somewhere else or undefined ?

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> library(lme)
> data(Orthodont)
> fm1 <- lme(distance ~ age, data = Orthodont) # random is ~ age
Error: Singularity in backsolve at level 2, block 1> 
> fm2 <- lme(distance ~ age + Sex, data = Orthodont, random = ~ 1)
Error: singular matrix in chol
Troels Ring, MD
Department of Nephrology
Aalborg Hospital
Aalborg Denmark

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